The game for PC/Windows is available at Steam or itch.io. A free demo is available.
The full version of the game is free for GNU/Linux. Get it at Gamejolt.
For Android, the game is available at Google Play Store. There is also a free demo there.
The full PC version of the game can be modified. You can modify the levels or create new ones and share with your friends. Check the guide.
Contact: firstname.lastname@example.org .