Part of your description says this is barely done, and it's definitely that. I'm not going to focus on that though, because I think your design is much more interesting than its shortcomings. You've got this two player semi-asymetrical game. Players can choose to play as either a horse, who is fast, or a dino, who's the win condition for the game. As a fun little party game that's actually pretty compelling to me. It's fast, it's easy to pick up on, and there's a level of light strategy to it. You may not have finished your project in much of a state, but I do think you hit on something kinda cool here!

I couldn't figure out how to play. I moved the guy around, but when I collided with the green things nothing happened. Are the green things apples? What am I supposed to do? 

The game is fun, and kind of silly. I think adding a score count or maybe some obstacles would've made the game perhaps even more better.

Hehe this horses changing to Dinos and stealing all our apples, fun little game.

Cool idea, also nice that it supports local multiplayer.