I love the music and aesthetic of this game. But it is indeed very frustrating to control. I got past the first level after what felt like 50 tries, but I had to give up after as many attempts again on the second level. It's too easy to slip off a platform, bump your head on moving platforms (though sometimes you go through them?), or fall off ladders, and the delayed death response doesn't help either. But if it were slowed down and more friction applied, I think this could be really fun.
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I admit I'm pretty bad at using controllers, but I just tried it now with a controller and unfortunately it feels mostly the same to me. The only benefit was being able to finesse the analog stick to move very slowly, but it also has no dead-zone so it was quite twitchy.
In case it's of interest, I recently analysed a bunch of successful platformers based on the data in [1], and the jumps in most games are 1.5-2x slower than yours. I think yours could work very well if the levels and platforms were much larger, but at the current scale it's a bit too much for me.