Really fun and polished game.
The metroidvania genre is well applied and I didn't feel bored or frustated at any moment (except for the fucking bat).
I cheesed the boss by throwing a lot of square bombs before entering the room, so I kinda one shot him, could be good to start the fight just as you enter the room.
I wouldn't say anything negative about it except that the mushrooms bug sometimes and I got stuck a LOT of times.