A little to easy, all you need is to max mp and population in the upgrades then during a fight get as much MP as you can and spam out archers, game over.
Start off with few workers and 1 mage, by the time they attack u will have some mp and use the frost skill to put frost on the floor which will stop the enemy...Slowly upgrade your workers and base to make them go faster then pump in loads of mages and base upgrades..
The lag is really horrible after a while n i have a good pc =/
Seriously why are people complaning about it being too hard.
You have bombs, jump and a good attack...The 2nd level you are all moaning about...Run around in circles and make the saw guys kill each other, use the same tactic with bosses and other levels...
Its not about running in and spamming your a button.