This year I made a 'promise' to play the top 20 NES games as when I was a child/teen I never managed to beat any of those.
Steam Deck is such a boon that I can play my nostalgia games one hour before when I go to bed instead of doom scrolling reddit or whatever.
And I have actually beaten smb 1 and ninja gaiden (with save states) and megaman 2 without any saves and I feel so good!