Hiya! I purchased Prototype Mansion a while ago and loved it! I just wanted to chime in and congratulate the steam release, Im hoping for a key BUT will glady pay again on steam if the keys run out, to support you guys and the hard work put in on such a great game :D I'm looking forward for Ep.2 , it'll be an awesome compliment for REmake 2 next year ;D Keep up the great work folks!
If you purchased the game here on itch.io, you should be able to claim a key here. Just come to the Prototype Mansion page and you should find a 'Claim Steam Key' button below the download links for the executables.
Also we've updated the executables here to the latest version as well.