I liked. I thought it was funny that every time you jumped, it was like slamming the keys on a piano.
The platforming is functional, but crude and inconsistent in places. For example, the upper door has you using your boost jump from the start on the moving platforms, where everywhere else, only your second jump is boosted.
Apart from that, good work. You should make a bigger one at some point. No rush, though.
Also, hi from the Nifflas Support Forum!