I was curious as we have a similar game. First we had a pretty similar concept but ended up going for a slightly different approach.  Go and check it out, if you are curious too.

I like the swarm effect at the start.  I think with an horizontal circuit you could have a closest camera.

Of course some other circuit would had been great, but I know it's complicated in such amount of time. 

Overall, that was fun to play. Well done.

keep up the good work

Loved the game, the explosion sound does stack which gets a bit too loud for my liking, other than that it's awesome!

Cool game! It could have some more content but overall it is fun to play!