I agree, it's a plenty-polished game - I've had a blast playing it; I liked the world, graphics, and tiny touches such as the character's image squishing a bit when they jump :-)
The only problematic thing for me was, uhm, the jumping mechanism - I feel like either the colliders are too big or the player jumps for too short distance, since 95% cases of me dying was trying to jump over those solders 😅 (so a low-hanging fruit would be introducing a difficulty switcher that would affect the jumping height - that would make the game more fun to me)
edit: also, the camera accelerating to the player's direction (so fast-forwarding left/right) was a bit tough on my eyes - it would be nice if there was an option to disable it (or change its amplitude, so that it doesn't shift that much)