Wow, this one sucks, had to go all in on owls. Overall I'm not perfectly happy with this one, it does work, but it's not optimum, still need to work with it.
Timer is super short. Wave 1, get the auras and buff beams up, build 1 nest at each spot. This is enough to beat the wave. Place a summoner at each one. In combat collect mana and build the rest. Quick swap to app for the LT up North, then back to guardian. Keep guardian in and use upper to up everything, no TB in the group until the final wave.
Party: 1 Builder Guardian, 2 summoners with monk/huntress pets, 1 upper (final wave swap in TB monk)
Right now, 9 mins total time. And not perfectly stable, still taking some hits.