The reflect placement was taken from LaJon's build.

1. 3 LT stacked with 3 auras
2. 8 Fireballs + Oil trap (flame trap is placeholder), Use jester to move the oil trap between the cores.
3. Tower booster with chicken baller/Stone thrower aiming south wall standing near crystal. Tower boost should last until end of round where only ogres are spawning.

I use initiate boost ontop of tower stacks until final wave. Final wave add guardian summoner on LT stack and another on Fireball stack. Keep initiate boost up as long as possible and tower boost up until end of round. Buff beam needs to be maxed and potentially the Physical beams and Ogres if you're struggling. When unlocking the waves initially to get to wave 32 I used DPS monk ontop of tower stack with plane instead of initiate boost. South ogres can be replaced with spider queens, not sure how it would work though.

Build is probably not optimal but it works and since I couldn't find a build to use myself, I just tested a few setups until one worked to get the Mech pet. Stats shown are my stats not sure how much lower stats you can use but if you upgrade everything should be doable with lower.