What also makes the game more difficult and bloody irritating than it already is is the way that, as others have pointed out, henchmen undermine all your efforts to get through the level by chasing after everything that runs by. Grr!
If they're making tough units that take ages to create, just spam the unit you can make fastest and take over their territory instead of fighting them. They still only count as 1 unit so when they reach your side nothing major happens.
Really good, the gem crafting and combining is unique and makes a refreshing change from the other defence games. Plus the extra skills and amulets just make you want to play it more to achieve everything. 5/5
Damn good game but your car should be a bit more customizable with different colours and the ability to choose what you upgrade. The dodgy steering just makes it better!
Very good game, fairly easy once you have got the hang of it. For knights, power gauntlet stops them chopping your hand up so squish some villagers, then when they glow red take a good old squish before throwing them into the sky! Also, the freeze time and the antagonist electric barrier thing are very helpful if a lot of villagers are escaping (especially those damn rocket pack people!)