I love the art-style! The gameplay is super chill (until enemies spawn) and for a game-jam game it plays really well!
I'd love for it to have more potions, attacks, etc... There's lots of potential to explore here :)
For a concept of a game its not bad at all! Gameplay is engaging all the way to the 10th level, the look of the game gives off a cool retro TRON vibe, the music is awesome and nicely paced to the game. Would be awesome to see more levels and enemies, player customization is also a cool idea. Give this little project an 8/10, keep it up!