Not bad for the first jam project of a teenager! There is a lot to polish, but you should feel proud for managing to submit a finished and playable build.
Some things I would suggest you refine:
- the intro text is rather poorly written; I don't know if you are ESL but I got that vibe from the writing style. If you plan on adding more text in the future, I would pay attention to this.
- The controls were pretty floaty and could use tightening up.
- The pit of death is not indicated in any way to be different from other safe areas you can fall down into. There should be some kind of indicator to inform the player that falling down this way is bad.
- I don't understand what the point of the downwards slam is, considering any contact with the round guys is an instant kill
Either way though, solid start and good luck!