Awesome idea, this could be built into a really cool full puzzle game. Just add some art and a lot more levels and it could be really fun. The controls are already really good!

This is a really cool game and a great concept, you should continue it and make more levels and maybe add some art.  Interesting take on a platformer and could lead to some really cool puzzles.

Nice Game and creative concept, Needed more levels
Good Work!

I really liked this, it had a solid central puzzle mechanic, and you used it to good effect. There was a nice "Eureka" moment when discarding the blue upgrade cube in a specific way was required. (I liked the use of a little red square player character).

Nice idea. I could definitely see this concept as a full puzzle game

Interesting idea and implementation but need more polish.
When you creating your own project, always add a restart button (restart scene) for debugging.