It's an amazing game, just with a few bugs.
Some quality of life improvements I think would benefit the game would be to change how the damage text is displayed, because it's so hard to distinguish the twin shots in if they actually work or not, since it just shows as the same number. You could make it add up. Maybe also make the pause screen have more stuff, like how deep you are.
Some bugs:
I dashed into another room diagonally and got stuck on a block (on my first playthrough)
I dashed into another room straight on and didn't get in, until I dashed back.
Some ideas:
An explosive spell for more crowd control. I think the normal spell has a bit of explosion but I'm not too entirely sure.
Add a projectile curse where the enemies fire more projectiles.
Add an enemy spawn curse where there are more enemies.
Great game, if I would rate it it would be a 5/5