I liked it! It was challenging and fun and was really easy to pick up and play. Controls are responsive and it feels smooth. I really liked the leaderboard to the right, don't know what's going on on the left. Was there any music? I'm not sure it was on my part, it felt awkward without it.
Also, I couldn't find a fullscreen option and it was way bigger than my screen. At least the action happens in the middle, so it wasn't such a big deal.
Overall, I like where this is going. The UI looks retro with the rounded fonts and bright colors, reminds me of those early 90's games. I don't know if you were going for that, but I liked it!