For this build I have 4 characters out

1 TB Monk

2 Summonors with 2 Huntress / 2 Apprentice Guardians

and a DPS character to help handle ogres that get too close to the crystals

Each run takes about 7-8 minutes depending on stats, could probably run with 2 TB monks to alternate when cd is hit. Alternatively solo tb monk might work but my app stats are kind of low in comparison, so you might get a faster time overall

For rotation, try to have both sets of DSTs covering the crystal at an angle
the 2x seed bomber towers help clear enemes that get too close, and helps deal damage to some spiders

Your range doesn't need to be super high since this is such a small map, but the extra resistance from the nature pylon is helpful