Short but sweet, i like the limited colors aestetic :) also the crt filter looks cool, you made a good tutorial where everything is neatly explained and mechanics are laid out one at a time, i'd just say if i really had to nitpick, you should say that you have to press and hold the action button to take the key to avoid confusion, too bad there is no music or audio :( but hey nothing that can't be added later on.
Don't have any particular issue other than that, you god a solid base, just need some more levels.
Good job dude :)
PS : sorry about the accidental doublepost i missclicked :(