Ran the game on Linux through WINE, worked like a charm. I did have some freezing when attacking the breakable blocks - not sure if that's hitstop, but it doesn't seem to pause the physics (the character would appear lower as if gravity wasn't paused). Besides that, this game was extremely well done. I loved the unique mechanics using the whip. Doing consecutive jumps on the hooks or consecutive walljumps was difficult, but very satisfying. I think these mechanics can definitely be combined and expanded on. The art was also extremely charming and expressive. I loved the little bat guy.
Really impressed that this is your own engine as well. Great work!