WOW I can’t believe you’re only 15! This was great!!! Great art style, concept, and player movement.
some feedback:
increase “coyote” jump time - I.e. allow the player to still jump even if a couple of pixels off of a ledge. Many times I tried to jump right from the edge of a ledge and it wouldn’t register my jump. It will feel a lot better
enemy hit boxes - expand them a bit. Or maybe better, extend your attack range. You have to get super close to register a hit, which makes it impossible to avoid damage a lot of the time
Add longer invincibility frames after getting hit
on the map, actually fill in the terrain vs the sky/background. All the lines get kind of confusing. Also markers for save points and other important things
for health pickups- make them auto-pickup just by touching them rather than having to press a button. This confused me for a while
but ya those are just little tweaks, overall this is crazy impressive