Reminds me Level Devil and Opposite Day gameplay, also Flash games vibes.
That's good for a first game. Also, it perfectly fits the limitation.
I'll still give you some ideas of improvements : coyote time, smooth the dash, input buffering, stop movement at death and jump and dash SFX. And mabye more mechanics and better art if you plan to continue working on it.
Also, I wasn't able to get the right sandwitch. Even with the sprint button (that you don't mention anywhere from what I know).
Good luck on your gamedev journey !