Ok I guess...
Unfortunately, I didn't enjoy this game that much- because I felt the problems weighed it down too much. It was good, but not enough that I felt the need to finish it.
Firstly - the game lags- annoyingly. Of course you had the decency (I don't blame u for this though) to remove quality options, so I can't tell if its my computer or bad coding. But the game lags, and that's a problem.
Secondly- Invisible objects. I first noticed this when I hit a balloon going up, and then wasted all my fuel ramming into the balloon over and over again. This silly 'invisible' objects rule applies to everything except money, and I do feel it breaks the game completely; if you remember where things are you can double collect them, and everything else gets 'multiple hits' on you. It looks like things were made invisible instead of being removed, which is a big no-no.
Third - Power-ups. Now I invested in money, engines, battery and air resistance, so everything else is zero while those are about 1/2 way or 4/5, yet I cannot reach even the 2/5 of the way. Unless your powerups rise exponentially, (which by the battery increases of 1 I doubt) I don't see any realistic way I can finish the game without some serious luck. Which is why I stopped.
Those were my three main gripes, and without them the game would WORK perfectly. The graphics are great and the sounds are great. But overall, I don't know. Although I think the idea was a good concept, I don't see it implemented in the story (there are no humans at the party) and frankly, the game doesn't seem to fit it. I don't feel any reason to finish playing for fun, other than the OCD will to complete the game. Its a good game, but it needs a bit more than that.