For a first project, it's not that bad!
Though, this game really lacks sounds and, most importantly, a quick way to restart it. Waiting until the fade animation is over starts annoying you already after five deaths. In such infair-ish platformers giving the player a quick way to reset is a must-have.
And yeah, the game is really not scaling when opening it in Full screen mode
Wish you good luck with your next projects!