This is important, if your games are installed in a drive formatted in NTFS you will have problems with Proton/Wine/etc. One way to discover the issue is to run Steam from terminal and it will tell you the details in an error message
Sea of Stars. Nice RPG, inspired by Chrono Trigger. I’ve been playing that for some nights on my deck. Easy to engage, nice story and difficulty can be adjusted depending on how much time you want to invest.
Can I ask what solution helped you to pair them with the Steam deck?
But are your games installed in the Ext4 partition? See my other reply from before.