Such a love letter. I delight in almost everything about this, it's a handicraft. Apart from Limbo art styles, I sense a lot of Celeste flavour in the levels. Is that correct?
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Nice levels, I enjoyed them a lot! But I agree that platformers easily become too hard for the general player (some Celeste/Limbo screens and I Wanna fangames are notoriously frustrating). Difficulty options or tweaks to help the delicate designs speak to a wider audience will be a fine embellishment!