I just got done playing a little. Here's what I thought.
What I liked:
I liked the back-flip fruit toss mechanic. At first it irritated me but when I figured it out, it was actually pretty funny.
I liked getting Trick-shots. I accidentally threw the pear almost straight up and when it hit and I got the message, it made me smile and I kept trying to do the same thing.
I liked the combo score feature. That is definitely 1 thing that would keep a player playing. Trying to get the best combo they can.
Things I didn't like:
The first few runs, I got eaten almost immediately because the jump flip toss functionality didn't completely make sense. Once I got used to it, it was fine though.
The biggest problem I had with the game (and the reason I uninstalled it after the few runs I did) was the graphics. Your caveman and t-rex are both a 2d, vector, paper-mation style, and they look just fine. In fact I really think they are what defines the game. However, you then placed them along side some objects that are full 3d rendered sprites (for example, the snail). These 2 types of graphics don't look/work well in the same type of scene. In fact they clash really bad. That however would not be too terrible if it weren't for the fact that the world you are running through is a completely different graphic style (2d painted sprites).
My suggestion would be to pick a single graphic style and stick to it. I know for the average user, this may not be an issue, but there are others like me who will not be able to bear the lack of unity in style to be able to enjoy the game play.