hi! i realize you're probably still reworking this but i was able to get a little bit into it while going down my list. i think the game is a little tricky and the difficulty should be eased in a little more--the one 1x1 blocks were very tricky and probably should be introduced later on. with the controls it was often quite frustrating to get onto them + jump up and time the key presses. i didn't make it past level three and level two took a few tries. i will say i like your level design aside from that! you have a really good sense of how to teach your different mechanics, and i liked how the transporter was able to put me back to before a difficult jump so i didn't have to go all the way around again.
i think the graphics and music are both very charming!! i like your color palette and the softened edges on your pixelling--it's very pretty and easy to read.
i think the tutorials signs are very clear! i might even say some of them aren't entirely necessary: in some ways you already "taught" the z press by using it in the start page. i think that was a clever way to teach something. i think most of the others are just fine to leave in, and i could see the jumping being left in too as an extra hint. this is a gem for two weeks of work--excellent job so far!