Ive played all the trails games up to reverie outside the crossbell games on steam deck, cold steel 1 and 2 run amazing on max, cs 3+4 and reverie run great on medium to high settings. 4 prob was the most demanding on it but still very enjoyable and reverie runs great but every now and then the fan speed would kick up for cutscenes.

Haven’t tried them all on deck, but when I tried booting up Cold Steel 3, ran fine for me. I would run it by ProtonDB to confirm though.