I feel your pain regarding background music (this year I didn't even have any sound, lol). If I tried what you did the players ears would be bleeding. Not the case here, it was quite pleasant.
The game itself was also fun, even though I also got stuck at the robot levels. The first one because I didn't realise that that specific bar goes all the way up, because it only goes halfway unless you're back att the door.
The second one I for a while ended up in that frustrating position that I knew what to do, but couldn't execute it with the timing. That one would for me personally have helped to have controller support. Since you're using Godot it should be quite simple: just add controller buttons for the actions in input bindings.