So was a pretty fun game! I loved the concept of it and even the wobbliness of the cube was really fun and funny to play! (Video down below if you want to watch!)
It was a super simple and fun game but only problems I had with it were that the jump button stopped working half way through and when the cube went near the end portal thing, and the dev console randomly opened up halfway through while I was trying to get the cube to actually jump (that's probably my fault, sorry about that.) But main thing being that the jump button stopped working and that the left and right keys were also assigned to random keys as well (not sure if that was the intention.)
One other thing was the inconsistency of the music levels. In some levels it was louder and the others it was a lot quieter.
A personal suggestion would be to make the levels shorter but more intuitive to finish (if that makes sense?). That way the whole idea of finding the key to jump is the main focus of the game as well rather than finding it in the first thirty seconds and then spending the next two minutes finishing the level. Or even making the key switch every time you jumped on the next platform might be a cool thing to do. (Just a suggestion, the game is still fun as it is.)
Aside from the jumping issue, I think that it was really fun game. Only wished it were longer and had more levels! It was super fun to play! Good luck on future games or updates!