Challenging platformer, despite the fact that its only one level. I think the most similar game I've played to this was Neon White, so it took a minute to get a grip on the controls, but once you get used to it, I think the game handles pretty well. 

Sometimes getting the depth right on longer launches can be tough, since momentum drops off really quickly, but that's kind of a given due to the nature of launching Gonathan around like that.

One thing that I noticed was that the tracking on the enemies projectiles was a little inconsistent, sometimes they would predict my movement nearly perfectly, and other times it would be way off, even without me changing my trajectory. Probably not super easy to tweak the aiming calculation, but it might be something to keep in mind if you keep working on the project.

And I really enjoyed the ending sequence, running back to the entrance while getting bombarded by the stains, though there was some screen clutter in the open areas, since all the stains were shooting and you couldn't stop to kill them.

It would be cool to see more levels or complex platforming and launching sequences, similar to the final stretch of the game, once the jam is concluded.

I think that's about it from me though, great work, and thanks for sharing with us!