Cool concept, I just wish to have more in-game guidance at the beginning, but your description worked just fine.
I got stuck on level 3, although I figured out that I can just jump left from the beginning, but still the door won't open.
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Thank you! Good to know. I do have a goal to learn how to make UI elements by the next jam I do haha.
I'm not sure if you got stuck on a similar part as someone else, but there is a block in front of the stairs so that you can't just jump up them. However I realized that it wasn't that clear there was a block there, so I gave it a different texture.