Cookie Clicker is extremely fun, if not time consuming.yeah i had more fun then i should have on that game
Anybody heard about BROFORCE? http://www.freelives.net/broforce-gameLooks nice ill give it a try .
It's still in development, but you can play a standalone alpha build which includes about 10+ levels and a final boss. I played it with my friend the other day and it's fun as hell.