I think survivor-like type of games are inherently not cozy ;) Nevertheless, this was well executed and from what I've seen you made everything but music yourself, which is impressive! I especially liked the little leaf knight character sprite.
I think some feedback when hitting enemies would help - something like coloring their sprite white for a frame. The enemies in the 3rd stage had a lot of hp and I couldn't tell if I even dealt damage to them.
Music also felt a little jarring at first but in the later stages when the bass hit, it was really energetic and intense.