Maybe you need to increase the probability of finding something during searches. The game gets too hard. Add difficulty levels, increase visibility in night(flashlight perhaps?), be able to equip survivors. It's a nice game, but there is certainly a lot of room for improvement. 3/5
I'm a fan of TD games, but this quickly became repetitive and boring. The hard badge is there I think because you have to do almost the same thing for 30 levels.
The game is really good. I've played the original one on armorgames even before it got here on kong, and frankly, I'm disappointed that they restricted a class for armorgames only.