Hi!
Here is some feedback, but don't take it to harsh! I still enjoyed playing your game, even though I was really bad at it :D
When simply walking across platforms, the character jumps a bit, which doesn't feel good and makes the character hard to control.
When restarting from a checkpoint it doesn't respawn the platforms. I always need to restart form the beginning, which makes it additionally punishing.
Sometimes the platforms would start counting down even when I wasn't touching them. That had me confused, but I think some of them are linked? I would maybe indicate that with colors or something.
The beeping sound is somewhat annoying and it gets hard to distinguish because they overlap when multiple platforms are counting down. I would have made it so that you only hear it for the platform you are standing on.
But overall I enjoyed the character controller! Especially the longer jumps when holding space and the dash were nice.
The graphics are simple but look nice. I especially liked the animations on the character.
The levers introduce a nice puzzle element that I really enjoy and maybe can be expended upon further!
Overall: some improvements/bugfixes and its a nice platformer! :)