Line Runner 2
A few things you want to consider:
-I'm all for a challenge, but this game hardly gives you any time to anticipate new objects on the screen. I tend to hit rings and mines at random unless I'm going really slow, in which case I'm already too far behind my opponent. Perhaps you could allow the player more viewing distance but also increase the speed of the player's opponents, so that the overall difficulty isn't compromised. As it stands, this game is plenty challenging, but a good challenge is less satisfying if winning and losing become more a matter of chance rather than of skill.
-Another part of the problem is that all of the objects in this game are so detailed and so big. Everything just feels crammed on screen--again, I think this game would really benefit if the player were given more viewing distance. Additionally, because everything is so large and so animated, no one object really pops out visually from the rest; the background, characters, rings, mines, and other objects incoherently mesh together as the player zips by. The graphics need to be toned down, or cleaned up, or colored in some kind of different way. Otherwise, I just can't figure out what's going on most of the time.
With all of that said, this is obviously a very polished game. I think that conceptually, everything about this game is fantastic--you just need to work on the overall execution. You've obviously spent a lot of time on this so I don't want to demoralize you, I'm just trying to be constructive so that if you decide to make another one you have the chance to take these ideas into consideration. Keep creating :)