I played for a way to long. It's really addictive, reminded me the time i got addicted to cookie cliker. Really, if you keep working on it afterwards, adding some more level's of discount and upgrades you'll have a nice and addictive game. The only bug I've found is that sometimes you have enough exp to buy something but it does not allow you to buy. It was more for the upgrade side than evolution, but it's a very good game, nice job friend.