Oof ow my brain!
This is actually a lot of fun and I really like the aesthetic of it, with the old levels sticking around as windows in the background. I think my only gripe is that if you are using left/right to halt your horizontal velocity in midair, and then release them, our fair knight mysteriously starts gaining horizontal velocity again. I feel like after I've put in the effort to bleed that off, it should stay gone!