Tricky controls
... What am I even driving? Is that a car? It doesn't look anything like one. Also, that music is just horrific, and with no option to turn it off. The car is hard enough to control without speed boosts, and the upgrades did nothing to make it easier or more enjoyable. Having to switch from the arrow buttons to the mouse to click on upgrades is also a really bad break in the game.
Really, what is the point of this? What is the purpose to collecting those red things? I don't get it...