MarkoH01: Where on earth should I get 156 hours of free time? Dont you have something that's playable in ... let's say 20 minutes or so? ;)
Lol - fair point.
Though as I've added up some of the time I've sunk into a sum of other games that I didn't enjoy nearly as much (5 hours here, 10 hours there...), it doesn't seem quite as big a time sink.
Some of that was going back after completing the game and trying to get all the achievements and complete on harder difficulties. I'm not usually spurred by achievements, but a number of these were very creative and challenged me to try to win while strategizing very differently or playing more recklessly than just marching conservatively through each board.
After beating each level I would also stay on and attempt the infinite swarms (where you get credit for having beaten the board, but continue playing higher and higher (and faster and faster) waves until you're defeated for the challenge and bonus xp. So if all I was doing was beating the boards, I could've finished much faster.