Congratulations on your first game!
What I Liked:
I think it was a fun little concept, and I liked the music and art and overall retro aesthetic.
What I Would've Liked to See:
I struggled to get past the second level. I think in part it was confusion about what kind of enemies I could eat vs what types of enemies would hurt me. I think having a few simple, easy levels that introduce the mechanics & enemy types would go a long way towards this (it's a lot to take in at the beginning).
I also think it really would've helped gameplay to have some type of juice when you are damaged (e.g. a little screenshake our sfx or something)
Can't wait to see more from you!