First time I played, I became stuck in the first screen, the character was flipping constantly, had to restart the game. The second time managed to complete some rooms, attack detection was a bit strange. Didn't know if enemies fly or were falling slow (the character falls with gravity or something but not the enemies). It has almost no sfx, it surprised me when I heard the first one since I expected no sound effect from the beginning. Wasn't bad but felt like there was a lot of things to be improved.
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I was really struggling with a lot things using gbstudio. Maybe if I had more time I could have fixed a lot of the collision issues, but most were problems with my engine not having the best support of collisions in platformer mode. I'm glad you didn't give up on it right away despite it not working right off the bat however. Thank you for play it!