Ok, I'm not going to lie, the controls were bad, it was really frustrating to play. The jumping mechanics is very weird (some kinda instantaneous position change?), constantly making me fall off ledges and slide off surfaces. An impulse/acceleration/force would make a better jump mechanics. Try looking up tutorials on making 2D platformers for more information. (or use pre-made assets)
The graphics and premise is interesting though, and the winding up feature is also kinda neat. The tetris level was also a creative use of physics bodies.
Still, good effort though, making games (under 7 days) is extremely hard, so a buggy game is to be expected.