I should preface this by saying I'm not really into platformers generally, so I'm coming at this as someone who only plays them in jams.
The first thing I noticed is that there's no controls list. So it took me about 15 seconds to figure out how to navigate the menu, and then another minute to figure out how to actually select the options.
I made it through a couple rooms but I got myself stuck and just decided to give up.
I did try jumping to the new levels, but for me it was like the equivalent of someone who can't swim doing olympic diving lol.
The levels did seem pretty thought out though, and it was kinda neat how you could move levels around.
Visually the game looks quite nice, and the sound effects and music are fitting too.
The only major feedback I can give is to list the controls for how to use the main menu, since thats the first thing the player sees and its impossible to play this lovely little game without progressing through it.