Has potential, but too many "what the hell" moments to be really enjoyable... giant death boulders, obstacles that kill you when you're barely past them, and if you run out of energy while you're flying through the air, you do a full stop and drop to the ground. Whatever happened to the laws of momentum?
In the beginning, explain exactly what the heck is going on - there's apparently a plot, but I have almost no idea what it is... also, I don't know about anyone else, but I personally did not want to have a random, pointless math quiz attack me in the middle of the game for no reason. Especially with such a short time for answers.
Good for a start, I suppose... might be better to put credits at the END of your game though, or in a different submenu, especially when they are so long.
Hmm. Good game, but I agree, the random number generator tends to screw you over. Also, a LOT of it seems to be taken from Monster Master, as Garozerg said. A lot of the cards have the same name & effect as cards from that, though there are a few new ones, so it's not just a ripoff with better graphics... still, not sure if that's ethical.