This is a free (GPL-3.0) open source copy of some popular games full of ads but without them. Its made with godot engine and here is the source code: https://github.com/Dariasteam/TowerJumper.

All resources and code were made by me from scratch and are not derivative work of anything existent just the game is similar to other already existent. I make no profit with this game as its free open source and ad-free. The game was made for learning purposes and does not violates any copyright.