It takes a little bit of setup, but the game even works via Proton on a Linux OS Steam Deck.
1. Download the Standalone version of the game.
2. Add Player.exe to Steam via Games->Add a Non-Steam Game to Steam
3. Force Compatibility Tool (Proton Experimental)
4. Set in-game control method to mouse and keyboard (via F1 key)
5. Set controller buttons to emulate keyboard buttons:
My Layout:
D-Pad: Arrow Keys
X Button: Z Key
A Button: X Key
B Button: C Key
Y Button: V Key
R1: Space
L1: Shift
R2: A
L2: D
R4: S
R5: F (used to pick up NPCs)
Start: M
Select: F1