I kind of gave up trying after a while since it was so unplayable or I would have tried to go further.
Feedback: really fun game but like I said FPS problems for me around reaching 70 speed it started lagging sorry if the speed is deceiving I had around 100 speed when I took that fun game though. For the different things in shop, I wasn't really sure what they were since I just jumped right in and didn't read what they were so perhaps you could show what each stat means in game. maybe a bigger map? I was clearing the map pretty fast so maybe more people maybe add a setting for it in the start or make it so you have a chance to get a bigger map with more people, and that's all I really can say about it.
Your game is really fun Tho I would continue playing it if it wasn't for the FPS issues that's probably the biggest limiting factor currently and I've signed up to newsletter and I'd really like to see a full game for, this could see myself and others having fun.
edit :i got alot higher highscore then that but my pc crashed and i didnt save the picture