Thank you for your feedback! This was my first jam I've ever done.
I do agree that my game is a bit too short and it really could have used around 3 or 4 more levels. One reason for this may be that I might have focused a bit too much on the graphics rather than gameplay elements. Lesson learned from this jam: do not over-focus on game graphics unless it truly affects gameplay. Only work on graphics AFTER you have a working game.
But I guess that's the beauty of game jams, you get to learn about your limitations and how to improve your own skills based on the very limited time you have.
I'll be sure to check out your game soon!