Really good concept. Took me a bit to quite get the concept that it was scrolling, and I had to leave the an behind at the beginning, I kept trying to give him everything, and clicked on him before clicking on pretty much everything else before I figured out that he had no further part to play in the game. I think it would be nice to watch a little ape-man actually evolve, but that's my opinion.
Wish it was longer, and I agree with the suggestion for a fail option, especially if you make humourous little animations to go along with it. I thought it was brilliant that I could electrify the princess, got myself a bit distracted for a minute just doing that.