How to install required packages:

pip install -r requirements.txt

If it doesn't run after installing those packages (macOS, I'm looking at you), try installing pyogg too:
(Thank you, ambv, for that suggestion)

pip install pyogg

How to run:

python run_game.py

How to play:

• Push ball with WASD or arrows
• The effect is MUCH larger when hitting a wall or object
• Activate boost with SPACE (boost indicator is at the top right corner)
• Open the menu with ESC 
• Oh, and try to collect all the gems
• Happy rolling!

Cheats:

I implemented these mostly for development purposes, and forgot to disable them before uploading the file, so I’m just mentioning them here. They aren’t intended for use and might interfere with things like the score or your overall enjoyment of the game =P

• Ctrl-N - jump to the next level
• Ctrl-P - jump to the previous level
• Ctrl-R - restart current level
• Ctrl-B - fill one bar of boost