Easy Cash Farm: Level 4 Stage 5 (I use spike ball, missiles, and lazer core thingy) just spam back and forth killing everything until you reach the seaweed area. Finish those circle white orb, click upgrade > restart stage and repeat. I'm not sure about the time but I make 1.3k per round. each round is about 1-1.5 minutes.
I sat and watched Anabel be eating alive for a good ten minute. She got up and brushed it off like it was nothing. She even managed to dispatched two of them. Who's the real monster here?
My guy just sleep and let his maxed out turrets collect money. He lost all reason to fix his balloon. Not sure if he's dead or just having a really really good dream.