Lovely tight controls and well placed gems. Felt really good to play! Would have loved to hear some extra SFX for jumping, hitting, bouncing etc too!
Unfortunately I ran into a bug so couldn't finish; when I went to the next room after the room with spikes on the ceiling requiring a double-jump my guy seemed to disappear and I wasn't able to continue. I think I accidentally triggered going back to the previous room before properly arriving in the new one, if that makes sense. So I think it's my bad... haha
Great game!