Not bad
I've been playing a game like this for ages on my mobile phone, its called Gravity Defied, so i already have some skills :P did you get the idea from that game?
ah man my fingers are hurting now, damn i press my keyboard too hard.
i would have liked to have seen like a cliff map where your like right on the edge of a cliff and it feels like your almost about to fall down. it doesnt make much difference if you make the terrain higher, but it would create more of a "omfg im so high up" feeling. i would love to see some interesting maps such as a haunted house, in someones house, smashing through windows, driving from cops, more explosions and blood.
something i didnt like was that the background and the foreground sometimes were hard to tell, and so i would think on im about to hit this peice of concrete or jump onto of that busstop place.
the difference i noticed between this and Gravity Defied is that yours had more sharp corners, so it got quite frustrating getting over things, i would suggest maybe including a jerking motion to pull up? instead of having to bash the vehicle into whatever is infront.
people might ask for music, but i think that people should just pump up their own music while playing this game. the bike sounds got a little overused, but obviously that was going to happen.
maybe you can let the users customize their bikes next time? have a female rider? maybe some NOS? lol but keeping it realistic at the same time.
i guess ive played this so much on my phone that its great to see a version with better graphics. maybe you can make a high quality version where higher end computers can have great landscapes and lowend computers can have just lines lol.
oh and having the same maps for both vehicles was kind of boring, i was expecting to play the bike campaign and move onto the ATV's.
maybe you can have players be able to make their own maps? haha maybe thats just taking it too far.
good luck with the next version! "Stunt Dirt Bike: From Hell!"