Infinity Nikki on Steam works on Steam Deck but the situation is odd and anti-cheat blocks Desktop Linux
www.gamingonlinux.com
Infinity Nikki has now launched on Steam to suck away more of your time. It works on Steam Deck with Proton but the anti-cheat is blocking it working on Desktop Linux.

The game has ACE anti-cheat that blocks it from running on desktop. They’ve made an exception for steam deck to let the game run, but it seems like it only works with the LCD deck. A very odd situation