Hi guys AdminAnt here
with gemcraft Chapter Zero Guide to the last Level Gem of Eternity
As you can see he start of buy mainly focusing his building on the left hanmd side of the screen and places to towers sothe range of them has the maximum distance to shoot the enemys then slowly start working on the right hand side.
noone has beat the game without kill ever creep on the last level but the devloper does say it is possible.
anyone up for the challenge