Hi Moonlqaw! This was such a nice surprise, thank you for making a letsplay of Emerald Wasp!
They weren't turned into wasps per se, except for Béla they were normal humans but with a society shaped on the wasp ones, Irena wasn't the first queen so at least three generations occurred underground. The purpose was to create a society full devoted to a cause (and a queen) for military purpose. Béla is the exception, they used the parasyte to speed up the process instead of brainwashing people for years.
I'm happy to hear that you liked the game btw ;\\\; thank you for playing it! I'll go watch the video asap!