I love that you have a README and License file (main criteria for open source category). Your README is informative, fun, and I like the inclusion of screenshots.
The sound effects and music are super fun. I like that the levels are autogenerated so you can 't learn a pattern. The game gets fast super quick which is fun, and I enjoy that it's got a very addictive element to it. Graphics are boxy and cute. The confetti is a nice touch.