Man, this concept is really clever, but the gameplay really lets it down.
The game promises the ability to choose between growing larger and growing smaller as viable strategies, but the best small strategy (herbivory) seems to be broken by a bug; plants seem to stop spawning after a certain point, making non-Carnivourous (and therefore non-Gigantism strategies) not worth it.
There's also some polish issues in that the enemies evolve exactly when you do, but your positions and their positions don't get reset, so you could instantly be right up in a predator's face and instantly die.
The game's still quite fun, but it's really rough around the edges and needs a lot more polish. Hopefully it gets it though, this has the potential to be both really fun and educational.