There are some incentives for Roblox players that are pretty cool. For example, the Devil Neighbor skin and the cut voicelines. But you could take it a step further.
I personally am not big on Roblox, but you could do crossover cosmetics from other Roblox games exclusive to the Roblox port as incentives. A Seek from Doors cosmetic for Scary Neighbor, a Jailbreak cosmetic for Detective, maybe even a Piggy mask for the Butcher?
More potential for smaller crossovers for smaller developers has been opened up due to the Roblox port, and you can take full advantage of that.