ZOMG I think I saw a tank in day 27. It was blown up before it could fully enter the screen. (I am reading stuff in a different browser window and just keeping an eye on the game to check if I have to advance to the next day.)
Campaign (easy): Each day, hire two gunmen and one repairman. (Or more!) Get an uzi and a Flamer Joe ASAP. Keep upgrading your uzi. Put Joe in the middle. At level 10, buy a laser tower. At day 10, get a missile launcher. Keep upgrading your towers (including Joe) and hiring men during the whole game. After day 20, the game plays on its own. Day 22 just completed on its own while I was writing this post and barely paying attention to it.
Awesome game, so glad it came to Kongregate. Now it just needs badges. ;-)
And RiftRipper, that's not a glitch; that's intended like that because that castle is supposed to be damn hard. Personally I always have a hard time doing Save All Monks, as even a superweapon is no solution there...
Hacking is lame, of course, but Cheat engine donsen't have viruses - it's a common myth. It just triggers virus warnings because it interferes with other processes, just like viruses do.
If you like this game, go to ArmorGames' website and find Castle Clout. It is a lot like Crush the Castle, but it has slightly different gameplay. I love both games.