I think the progression of slowly but surely jumping higher and higher is pretty neat!

I think it'd would help to make the capsules single-use so the player needs to explore, rather than continuously going through the same capsule.

I'd also add a brief explanation of how the game works! I wasn't sure what to do and had to figure it out on my own - it would help to add some feedback for when you get an increase in jump height, and to maybe increase how much you, well, increase in jump height whenever you go through a capsule, so it's more noticeable! (For others: as far as I know, you increase in jump height and speed whenever you go through a capsule, allowing you to slowly but surely reach new areas)