Great demo, great game! Graphics are really styled well, and the music is banging! Played on GBA with headphones, and loved the music.

That being said - I've collated some feedback to help you.

• Need a pause state/button for a breather.
• Intro credit scene too short. Nice to be a little longer with a skip A button. I like to read the dev names, couldn't read them in time.
• Enemy jump SfX feel a little scratchy?
• You get hit twice with a falling screw or robot and can die instantly - could disable collisions for a second to let you get away from enemy.
• 2nd boss I was able to walk left off screen and the level was then stuck - had to reset game.