Quick answer
OFFICIAL state of the record: Valve has not stamped the game Verified or Playable in the compatibility listings we could observe by 2026-10-20, and the developer has made no Steam Deck statement. Performance claims are therefore UNVERIFIED one way or the other.
What facts we do have
- The game is Windows-only (runs on Deck via Proton, same as most Steam Windows titles).
- Requirements are low (GTX 1050 minimum class); the store carries "Camera Comfort" and "Playable without Timed Input" categories — both reduce handheld friction.
- One player review mentions dizziness during first-person mowing; comfort in handheld play may differ.
Safest first step
Install the free demo (Steam appid 4552080) on the Deck before buying the full game: it is the same engine and tools without spending anything. If the demo holds 30+ FPS in the open level, the full 15-map campaign likely performs in the same range.