I had fun playing this! The puzzles are well made. I did have a little trouble with the last one though (I too mistook the lever at the bottom to have functionality besides being a reset switch) but I pulled through somehow. Visuals and SFX are pretty good and complement each other. I really liked how the keys worked!
I only have three suggestions:
- the gems need to be more contrasted from the background as it was easy to miss the really tiny ones.
- the jump felt a bit too floaty above a certain height.
- maybe stacking another mechanic would give more complexity to the puzzles, but perhaps that’s just something to consider if you ever extend this in the future.