First of all, congratulations for participating for the first time, what an game entry you managed to create! I personally love score-attack games, so this was rights up my alley. It's surprisingly difficult, it took me quite a while to break the 10k barrier, but after that I started to get a couple of 20k runs, before finally reaching my current record of over 37k.
The art direction of this game is just lovely, it feels like a released mobile-game, which brings me to my next point; you should consider releasing a version on the app store. It would work really well with touch controls :)
Fantastic job overall! :D