Thanks for playing! I should have signposted it, but there are zones in the center(follow the green paths in between the pillars in the center) where you can replenish your knockback charges. I put them where they ended up in the final game, but changed the terrain around them and didn't even think about how hidden they were; Since I obviously know they were there, I just thought of them as being in their place, but if you don't know they exist, they're probably pretty easy to miss. Despite being such a small game, simple stuff can still slip through without even thinking about it.