I think there are some obvious points to highlight; the visual and sound aspects are great, although perhaps the boss music is a bit loud compared to the rest. The gameplay is excellent; I enjoyed the feel of the combat and the movements in general. But something I would like to highlight is the level design, which I think is excellent. At no point did I feel lost, but I also didn't feel like the game was holding my hand; it definitely has that Metroidvania element that invites you to explore and constantly change routes until you find the necessary upgrade, and I thought you executed this part greatly.
My only problem is the menu when dying. Several times I was about to close the game because the menu responds immediately. And while fighting the boss, it finally happened :(
I was playing so frantically that I didn't realize while I was pressing buttons like crazy and closed the game when I died. I can simply suggest leaving the Resume and Back to Menu buttons. Or maybe have a saving system, haha.
Anyway, I've almost rated this game perfect; I think I'll try it again soon.