The game is polished, and works well, although I feel like the biggest critique I have is the lack of an engaging/interesting core gameplay mechanic. I feel like there was a lot of potential here.
But considering it's your first game jam submission it's certainly very impressive especially for a solo effort, and a fun game for what it is.
The art style is definitely the strongest aspect of the game here. It definitely stands out from the other submissions in that regard. Overall a decent submission! I look forward to seeing what you make next!