https://youtu.be/lTgXqomGUUw - Video link if it helps you follow along easier.

I'll start with a summoner out so that you can jump onto the top crystal, and fly to press the first button, and then turn around and grab the one under the stairts to unlock the DDR minigame. You can either do blue difficulty, get to 65 score, miss one, and then step on one more to get 42. OR you can do green difficulty, get to 75, and then miss all other moves.

Hints 1 and 2 are where you will buiild your towers, and what you will stack. The fireball tower really just fills up the remaining DU after the LTs, and is handy for the extra DPS on ogres, especially on RL.

Hint 3, you'll want to reduce the size of your ensnare aura to around 60% just so that it isn't slowing the enemies coming out of that nearest spawn. The other ensnare can stay as is.

I like to keep my builder apprentice out for the extra damage boost. If you're using an adept you can just stand near your towers and activate your upgrade aura while your tower booster drops your adept mana to upgrade throughout the waves.

I ran 2 guardian summoners using  2 monks and 2 huntresses, and a tower booster.