Really great art! :o I can see the Hollow Knight inspirations, but visually and musically it has its own charm.
The control and the combats are nice. There are even enough feedbacks (screenshakes, sound effetcs...) to make the game feels absolutely juicy. The only issue I had was the boss: when it spams the attacks that spawns ennemies, it becomes unmanagable. By the way on my first run I was able to leave the boss arena to explore a bit around. When I came back, it was surrounded by dozens of ennemies, and was absolutely unbeatable! :p Fortunately I got lucky on my second run, and was able to defeat it.
I realised on the process that exploration is not really rewarded. But for a jam game, it's perfectly ok! I had a great time discovering the level the first time. :) Really great job overall!