I liked the sprites and the backgrounds. I also liked the music choice.
One thing I noticed was that I could just jump from platform to platform while avoiding most of the enemies. You could potentially fix this in several ways, such as maybe having enemies on the platforms or maybe spacing the platforms out a bit. This would also make the power-ups more useful as I didn’t ever really feel the need to use them.
Since the main “invisible platform” gimmick is tied to pulling the levers, I think it could be beneficial to make the process of getting to the levers more challenging. Right now, they're in plain sight and easy for the player to reach with very little resistance.
Thanks for submitting!