I am adding some more details about the projects.. The caves in the ThrustMe levels are fully procedural, every time you start the game you will get a new cave. I'll drop a link to a playable alpha-build (with bugs and it is untweaked so wait for the real release) on the web: https://thefile.ninja/thrust.htm

About QuantaMerge, this game is actually using a Physics engine for the falling blocks, it is not a regular Tetris clone..