Adventure games don’t sell too much, and four episodes are a lot if you make them separate purchases. Episode 2 would be purchased only by a fraction of episode 1 users, then episode 3 from a fraction of episode 2 and so on. And the longer the time between episodes, the smaller the chance it would generate new sales because existing users lost interest.

It’s instead much more remunerative to think a fun gameplay mechanic, then create a fake ad around it, buy some assets and create an idle game that plays by itself with the possibility to pay to get it faster. Use the fake ad with the fun gameplay to promote the completely different game and users are dumb won’t complain. Don’t worry if the assets you purchased for your asset flip are unrelated, it’s also allowed to be a completely different genre, for example evony (medieval and swords theme) is using zombies, tanks and machineguns in ads