First Wave: Gather all mana, place down auras, beams, gasses, and an archer at each buff. Then use a Jester with a Genie to gather mana, or gather manually to upgrade buffs. Second Wave: Build everything else, try to place the DST's at Hint 2 towards where the ogres will be walking from and to.
DISCLAIMER: I have not tried with lower stats, but this worked for me at about these stats. The main thing you stat boost you want to be aiming for is the set bonus, as mythical gear is where it really starts to matter.