The idea is nice! I like that you can't see the other character, so you just have to make a mental image of the map, the controls feel smooth! Well done with the character controller :D
I can imagine the dinos having dialogues and talking to each other once in a while! I can see them as brothers that dont go along very well, but need to work together to get the treasures. Adding a bit of narrative to the game is a huge plus! So if you think about updating it, maybe consider writting a little story and dialogues :D
Adding the instructions and controls at the beggining would be perfect too!
Nice done!