I've added it as a non-Steam game and it runs REALLY well on Steam Deck. The view distance is phenomenal and I play at 40hz/40fps.
Edit: the only issue are the controls, I made the DPad be the arrow keys, left joystick WASD, I made AXBY = keyvoard Space X B Y. That's enough for most controls but a couple buttons are leftover, I might make it so that holding LB enables alt controls for extra buttons