If you and/or the other person you are planning to play The Past Within with own a Steam Deck, we're happy to let you know that the game is now officially verified on Valve's awesome handheld device!
Let us know how you're enjoying our co-op experience on Deck!
https://store.steampowered.com/app/1515210/The_Past_Within/
Ps. Tomorrow is the last day you can nominate The Past Within for the Steam Awards:
https://store.steampowered.com/news/app/1515210/view/3521280936466171045