Unfortunately, I could not play your game to the end, because it freezed regulary.
The part I had a plesure to play was made very good. Powerups have a "tutorial" area to them. Rooms are well planned, metroidvania-ish map style is present.
Knockback on attacking felt out of place: it is more common to be knocked back if you get hit or enemy/object is invulnerable/untargetable.
Good platforming controls are present, so it's a huge plus.
Great entry overall! Good luck!