Hearing the elevator music had me laughing at the start before noticing this is really nicely done!
Each level introduces a new concept pretty naturally, with the only confusion from the "Gravity Gun", as I thought it as a glitch when I first used it. It's a super unique idea and excited to see where the game goes next, you have a cool foundation here!
I also found a bug where by stacking two White blocks and spamming the swap and jump buttons, you can fly.