In version 1.0.1, which is available here on itch, There is already a nude skin you can use. You have to beat the first level and then you'll unlock the "Friend" skin.
I'll have a look into possible cheat codes you can activate in game. For now tho, I have also posted my game on F95zone, someone else made a cheat engine table for Cabin Fear in case you want to already use them.