It’s a mood that adds mouselook. I don’t know about steam deck but it’s literally 3 downloads (gzDoom, Brutal Doom and Extermination Day) and a whole new campaign with new weapons. Really excellent.
Finished SuperLiminal last night which I really enjoyed, really intuitive and flow inducing game that makes you think and has a nice message to it. Started Shadow Warrior 3 but I’m not sure it’s for me. Biggest recent ones have been Brutal Doom (Extermination Day) which is unbelievably good and Halls Of Torment (Vampires Survivors but like Diablo)
I’ve only just started but using Jerboa and it seems pretty decent. I used boost for reddit and am signed up to be notified of their Lemmy app as I was a big fan of that app but this will probably do until then.