diff --git a/MANIFEST.in b/MANIFEST.in
deleted file mode 100644
index 1aba38f..0000000
--- a/MANIFEST.in
+++ /dev/null
@@ -1 +0,0 @@
-include LICENSE
diff --git a/axuy/__init__.py b/axuy/__init__.py
index 711291a..b8e0246 100644
--- a/axuy/__init__.py
+++ b/axuy/__init__.py
@@ -16,7 +16,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with Axuy.  If not, see <https://www.gnu.org/licenses/>.
 
-__doc__ = """Axuy is a minimalist peer-to-peer first-person shooter.
+"""Axuy is a minimalist peer-to-peer first-person shooter.
 
 This package provides abstractions for writing custom front-ends and AIs.
 All classes and helper functions are exposed at the package level.
@@ -25,11 +25,12 @@ Some superclasses may define abstract methods which must be overridden
 in derived classes.  Subclasses only document newly introduced attributes.
 """
 
-from .misc import *
-from .pico import *
-from .peer import *
-from .display import *
 from .control import *
+from .display import *
+from .misc import *
+from .peer import *
+from .pico import *
 
 __all__ = (misc.__all__ + pico.__all__ + peer.__all__
            + display.__all__ + control.__all__)
+__version__ = peer.__version__
diff --git a/axuy/__main__.py b/axuy/__main__.py
index 6ec7ffe..7129825 100644
--- a/axuy/__main__.py
+++ b/axuy/__main__.py
@@ -19,7 +19,7 @@
 __doc__ = 'Axuy main loop'
 __all__ = ['main']
 
-from .control import CtlConfig, Control
+from .control import Control, CtlConfig
 
 
 def main():
diff --git a/axuy/display.py b/axuy/display.py
index 524bbe0..a6c23f0 100644
--- a/axuy/display.py
+++ b/axuy/display.py
@@ -32,9 +32,9 @@ import numpy as np
 from PIL import Image
 from pyrr import matrix44
 
-from .peer import PeerConfig, Peer
-from .pico import TETRAVERTICES, OCTOVERTICES, SHARD_LIFE
 from .misc import abspath, color, mirror
+from .peer import Peer, PeerConfig
+from .pico import OCTOVERTICES, SHARD_LIFE, TETRAVERTICES
 
 CONWAY = 1.303577269034
 ABRTN_MAX = 0.42069
diff --git a/axuy/peer.py b/axuy/peer.py
index 3566a8d..3df9c96 100644
--- a/axuy/peer.py
+++ b/axuy/peer.py
@@ -26,7 +26,7 @@ from configparser import ConfigParser
 from os.path import join as pathjoin, pathsep
 from pickle import dumps, loads
 from queue import Empty, Queue
-from socket import socket, SOCK_DGRAM, SOL_SOCKET, SO_REUSEADDR
+from socket import SO_REUSEADDR, SOCK_DGRAM, SOL_SOCKET, socket
 from sys import stdout
 from threading import Thread
 from typing import Iterator, Tuple
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..6a44bcb
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,34 @@
+[build-system]
+requires = ['flit_core >=2,<3']
+build-backend = 'flit_core.buildapi'
+
+[tool.flit.metadata]
+module = 'axuy'
+author = 'Nguyễn Gia Phong'
+author-email = 'mcsinyx@disroot.org'
+home-page = 'https://github.com/McSinyx/axuy'
+requires = ['appdirs', 'glfw>=1.8', 'moderngl',
+            'numpy', 'Pillow', 'pyrr', 'setuptools']
+description-file = 'README.md'
+classifiers = [
+    'Development Status :: 3 - Alpha',
+    'Environment :: MacOS X',
+    'Environment :: Win32 (MS Windows)',
+    'Environment :: X11 Applications',
+    'Intended Audience :: End Users/Desktop',
+    'License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)',
+    'Natural Language :: English',
+    'Operating System :: OS Independent',
+    'Programming Language :: Python :: 3.5',
+    'Programming Language :: Python :: 3.6',
+    'Programming Language :: Python :: 3.7',
+    'Programming Language :: Python :: 3.8',
+    'Programming Language :: Python :: 3.9',
+    'Programming Language :: Python :: 3 :: Only',
+    'Topic :: Games/Entertainment :: First Person Shooters']
+requires-python = '>=3.6'
+keywords = 'fps,p2p,opengl,glfw'
+license = 'AGPLv3+'
+
+[tool.flit.entrypoints.console_scripts]
+axuy = "axuy.__main__:main"
diff --git a/setup.py b/setup.py
deleted file mode 100755
index d65dc85..0000000
--- a/setup.py
+++ /dev/null
@@ -1,39 +0,0 @@
-#!/usr/bin/env python3
-from setuptools import setup
-
-with open('README.md') as f:
-    long_description = f.read()
-
-setup(
-    name='axuy',
-    version='0.0.10',
-    description='Minimalist first-person shooter',
-    long_description=long_description,
-    long_description_content_type='text/markdown',
-    url='https://github.com/McSinyx/axuy',
-    author='Nguyễn Gia Phong',
-    author_email='vn.mcsinyx@gmail.com',
-    license='AGPLv3+',
-    classifiers=[
-        'Development Status :: 3 - Alpha',
-        'Environment :: MacOS X',
-        'Environment :: Win32 (MS Windows)',
-        'Environment :: X11 Applications',
-        'Intended Audience :: End Users/Desktop',
-        'License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)',
-        'Natural Language :: English',
-        'Operating System :: OS Independent',
-        'Programming Language :: Python :: 3.5',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
-        'Programming Language :: Python :: 3.9',
-        'Programming Language :: Python :: 3 :: Only',
-        'Topic :: Games/Entertainment :: First Person Shooters'],
-    keywords='fps p2p opengl glfw',
-    packages=['axuy'],
-    install_requires=['appdirs', 'numpy', 'pyrr',
-                      'moderngl', 'glfw>=1.8', 'Pillow'],
-    package_data={'axuy': ['map.npy', 'shaders/*',
-                           'icon.png', 'settings.ini']},
-    entry_points={'console_scripts': ['axuy = axuy.__main__:main']})
diff --git a/tools/aisample b/tools/aisample
index fccb6cb..d562d7e 100755
--- a/tools/aisample
+++ b/tools/aisample
@@ -20,8 +20,8 @@
 from itertools import chain
 from time import time
 
-from axuy import (INV, RCOLL, PICO_SPEED, SHARD_LIFE, neighbors,
-                  Shard, Peer, Display, DispConfig)
+from axuy import (INV, PICO_SPEED, RCOLL, SHARD_LIFE,
+                  DispConfig, Display, Peer, Shard, neighbors)
 from numpy import floor
 from numpy.linalg import norm
 
diff --git a/tox.ini b/tox.ini
index b9bf329..60f24ac 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,3 +1,21 @@
+[tox]
+envlist = py
+minversion = 3.3
+isolated_build = True
+
+[testenv]
+deps =
+    flake8-builtins
+    isort
+commands =
+    flake8
+    isort -c --diff
+
 [flake8]
-ignore = E226, E701, E704
-exclude = setup.py, __init__.py
+ignore = E226, E701, E704, W503
+exclude = __init__.py
+
+[isort]
+balanced_wrapping = True
+combine_as_imports = True
+known_third_party = axuy