I haven't yet used the stick on any game. I guess I need to try enter the gungeon or something on it.

Yeah, I bought a case that gave it big grips. It helped a little, but still had the issue. Now I just use the Deck.

It's a great rogue lite/turn based/tower defense/ survival game. I highly recommend it! (as said below, The Last Spell)

O don't get me wrong, I love my Steam-deck. Maybe I need to change my grip?

It's not near as bad as the switch, my hands used to start to go numb if I played for more than 20 minutes on that.