Hello,
I cant promise at launch. I dont have SD dev kit, nor enough dev to develop an SD version simultaniously.
in theory, the game should be able to be run in steamdeck via steam's proton.
right now, i'm downloading the demo through itch app and will add it as a nonsteam game to steam library and in the preferences select run with compatibility tool "proton Experimental".
i've done this with many other games so far and others have already confirmed that it works for almost all titles on Arch Linux (which the SteamOS is based on).
So maybe all you might need to do is to provide (thoroughly tested) instructions on how to do that.
The problem is not proton, the problem is that SD simply not enough strong to handle the game, and i would have to develop another version of the game with reduced textures/meshes/effect quality, so as in the case of other games which has SD version. For that i would need more developers to work simultaneously on the SD version. ( which i dont have )
Might after the release.