Wow, this is really exactly what you expect from a game-jam game. Exactly one, but very polished, unique and challenging game-mechanic. Simple, but good looking graphics. Same for sound. And all in all a perfect fit for the theme. And as a bonus it even has a shop, wtf :-D
There was actually just one little bug (or maybe i did not really get, how to get them). When shooting one of the power-ups, they appear, but i couldn't collect them. Neither by driving there nor shooting or so?
But nevertheless, all in all, this one is really a 5 stars masterpiece. One of my favorites of the jam so far :-)