A little too hard to control your buggy. It would be better if your upgrades were more granular (i.e. upgrade speed, weight, etc separately). Needs a sandbox mode ... oh ... wait ...
The good:
+ Nice simple concept.
+ Good graphics.
+ Impalements.
+ Decapitations.
+ Kicking people in the jewels.
The bad:
- Needs a pause key
- Needs configurable controls
- More depth (heals, enemy variety, etc)
Creative and simple game. 4/5 ... the -1 is that the timer is a bit too tight on some of them. Makes the game more about twitch reflexes than thinking.