Carp A Diem is the first stage in Koi Awakens!
The level contains a bunch of strong Red enemies, Enemies progress from a cluster of buffed Sir Seals, a Shy Boy, then a H. Nah. After the second H. Nah, the enemies will stop spawning. The enemy base will first spawn three sir seals and a jackie peng, then another cluster of the same enemies. When the base is hit, Kiss and Koi (Enemy) spawns.
The idea here is to use the starting enemies to get money, then spawn your attackers to kill Kiss and Koi. Keep in mind that it is a Floating enemy and that it has 400 range, meaning that even Dragon Cat gets outranged. Instead, use things like Bahamut Cat, Ururun Wolf, or any long ranged ubers to kill it. Rushers like Fishman Cat and Awakened Bahamut Cat also work here to deal a lot of damage to the boss. Once you kill the boss, kill any remaining enemies left and you're free to destroy the enemy base.