I like the presentation, though the character is very tiny.
The physics are a bit unpleasant, the character feels like they're walking in sludge because they start off very slow when moving.
There's a bug in the platforming; I often got stuck in corners.
I wish you could see how the world is in the other dimension, that would help the gameplay feel better.
For several levels, if felt like the dimension swapping wasn't really a relevant mechanic because you had an extended section in one dimension, and then swapped once before finishing the level.
"N.B: Keep in mind this is a rage game, continous fail is expected.... if you're a noob"
I'm going to be honest with you. Statements like this sound like you're making an excuse for low-effort level design. "It's not punishing, frustrating design, you're just a noob. Git gud."