Nice platformer, although I'm not very good at this kind of game.
-The tutorial should point out more clearly how even a small running start will greatly increase jump distance.
-I think the rolling mechanic gets more in the way than it helps since needing to coordinate jumps with switching world's already felt pretty challenging and the rolling isn't very dynamic since you only need to use it in the tight passages.
-The part where movement keys can change a jump trajectory mid-jump often felt to be working against me, in particular in the sections where we need to jump between walls.
-Very appreciated that there's plenty of checkpoints.
-Pretty good music and graphics, love the different backgrounds in particular!
-Where's the evil AI taunting the player? I'm pretty sure there's some rule that if you're making an evil AI in a game, they must taunt the player now and then somehow.
Good work so far!