First round, build the auras, the EV beams/barriers/walls, and as many SAMs as you can.
Switch to a charater that can gather mana- mana is tight on this map.  One character is easiest.

After first round you may have to rebuild EV SAMs so you can stack them, but it's ok

2nd round build everything, switch to upgrader.  Stand near, attack the ogres that get stuck.  You can fully upgrade on wave 2.

The ogres should get caught at (3) without actually attacking (they are out of range), (2) on the crystal trying to get to you, and (4) in an endless loop.

You might have to go lure them away from 4, just make sure they don't slam down when you are near the crystals.

This build was easy with ~8k stats, will probably work for less since the ogres don't actually attack anything.