Word-for-word what @Edgor said (damn dude, it's like you're in my ahead a few hours in advance XD).
-Could be fleshed out more
-Wish there was a bit more consideration to what a player is likely to press (such as wanting to immediately see the yield of their latest platform movement) or what they might need/want to see (it may be that you wanted to prevent the player from viewing every layer at once on purpose to add an element of memory, but just consider your design goals and see if it makes more sense for them to be able to view all layers at once). A similar thing happens with the arrow showing the player's spawn location. Logically, they'd think the player always spawns there, but they don't, they spawn up top (which is fine, just be sure to playtest early I never find time for this either but it's important I swear and see what the average player's expectation is for a visual cue like that).
-Pretty interesting idea, though, and nice music. The art served what it was needed and the controls felt snappy, simple, and well-fitting as well. No need to overcomplicate there.
-Perhaps instead of listing Enter as "starting the game," it should be listed A) on-screen, as it is critical, and B) as "spawn player" or "run current layout" or something.
Don't stop here, though ;)