To get you to Juliet:
EntropyAlien, 2 Ultimas, 2 Chakras (All max upgrades with your best gems possible)
Defeat Juliet:
SoulSeeker, EntropyAlien, Chakra, ScarFace, and Corpse King.
Equip 1 best Attack Gem and 2 best Health Gem to Chakra. Equip remaining Attack Gems on SoulSeeker while the remaining Health Gems to ScarFace followed by Corpse King. Make sure all of them are max upgraded.
Getting to wave 25:
3 Shadow Killer (equipped with the best attack gems +30 +15 +15) + 1 Juliet (equipped with best health gem +500) and 1 Devourer (equipped with +350 health, +40 speed and +10 attack gems)
This format will work as it has done for me. Keep re-trying as it depends on the probability of a strong attack and your enemies weakness.
Really fun & addictive game! Some suggestions?
Coins automaticaly collected
Elevators should link up
Faster speed up (e.g skip a day)
Bit lagging when holding down shift..(Maybe just me)
Other than that great game. Favourited.