Thanks for playing and for the feedback.
At first I wanted to allow the player to place multiple cells each turn and I had other mechanics in mind with more evolutions and more conditions that would require the player to wait some time until things evolve so the rock was here to make a wall slowing the decay.
But I didn't know how to show everything properly (my art skills are... limited) and I didn't have the time to make everything so I shrank the scope of game to something smaller that I can release in time.