Since we're trying to keep the CS factor intact, I think we should break the game in the same format as we're doing this mod.
So, in a WTF (TM) world of Cave Story (TM), we witness magic (TM) and advanced technology (TM) being contemporaries. A mysterious floating island (TM) is rumoured to be host, not only to strange creatures (TM), but some unknown force as well. Inhabitants of the island, mimgas (TM) and gaudi (TM) represent the only life signs of the once-lively island. A research party (TM) is sent to investigate, but greed (TM) for power (TM) creates an enemy for the world within the party itself, and unless this greed is crushed, the CS world is doomed...
I've exluded everything regarding the robots, mainly cause I'm lazie, but also because that requires me to explain a bit of the past, which doesn't really fall within the main outline (I consider it mainly as backstory).