I love this idea and the animations looks amazing :D I would love to see some tiny dinos like Aquilops or Hypsilophodons. I also think the slight downside is that dinosaurs only live on the bottom line of the screen, so maybe even something flying like Rhampho?
Also have you considered a free demo? With, for example, a time limit or a single species of dino.
Anyway, great work, keep it up!