In all honestly, the only reason I made sure to play this game all the way through, was for the achievements. Personally, now that I have them all, I will not be playing this again. There is just no replay value what so ever. This is not an insult to your game developing skills mind you, just input from a fellow gamer is all.
Badge Guide: Day 1 - Max out Trans+Engine+Tires and spend the rest on fuel. Hold down the Only take your foot off the accelerator if you're going to be off the ground for more than about half a second. Try and keep your wheels parallel to the ground. You should get around 730 ft. Day 2 - Max out fuel, get the autogun and as much ammunition as you can afford. Do the same as before. When you reach the final hill, it's broken into three slopes. You should be able to get part way up the third. If not, restart and try again. Day 3 - Put everything into Boost. Do the same as the previous day, and when you hit the the third slope of the hill, hold boost and fly over the barrels. Don't bother voting up, just repost. Credit for this goes to razzfallow, this is how I got the hard badge.
 "Battle Pool"){kind=icon}
 "ELEPHANT RAVE"){kind=icon}
 "Infectonator 2"){kind=icon}
 "Cyber Chaser"){kind=icon}
 "Earn to Die"){kind=icon}
 "The Last Stand: Union City"){kind=icon}