For a first game jam game, and for devs so young, this is pretty good! I liked the music and the art was alright. the concept was also pretty interesting and used well.
However there are two major things that make the game a lot more frustrating than it should be;
- The jump is very unresponsive on some levels, and it takes a couple of presses to actually cause you to jump, making it harder to jump over spikes (I got stuck at level 7 because of this)
- The player hitbox is too large. It's too easy to hit your head on the ceiling or run into spikes by accident.
Despite the issues, the game was still good! It just needs a lot of polish. I have no doubt you three will go on to make even better games in the future!