Great job! It reminded me a little bit of the paper clip game, but much, much nicer to look at.
One thing that might make it more interesting to play would be to explain more what different things do. For example, "A" improves happiness by X now, but "B" improves happiness by 2x one minute later, and "C" doesn't improve happiness at all, but increases the click rate by Y, while "D" increases it by 2Y for a limited time. Anyway, great job!