It's come to my attention that many users on Linux devices, including the Steam deck, are experiencing inconsistent, and often severely degraded performance since the update to Unity 6.3.
I am actively working to resolve this as soon as possible. My apologies to those effected.
Prospective purchasers -- if you are on Linux I would recommend delaying purchase until this message is replaced, or switch to the beta branch, as described below.
For those who have purchased -- my hope is to have this resolved in short order, but you are of course more than welcome to utilize the refund system if available. Otherwise, please switch to the beta branch via Properties -> Game Versions & Betas -> betatesting
This will be the most recent build configured with Unity 2022.3. It will be lacking newer content, but should play much more stably on LInux devices.