Is there any way of sorting the games via DOS only titles, or any list of games that only run in DOS/DOSBOX? I’ve recently installed DOSBOX on my android tablet and started playing UFO: Enemy Unknown on my tab, but straight up I’ve started wondering if there’s some sort of list of DOS only games available on GOG? There’s one on DOSBOX Wiki but it hasn’t been updated since 2011. Thanks.

There used to be a gog mix for that, but they eliminated gog mixes. You could start by viewing games by oldest first. Up to a certain date, they'll all be DOS (although I haven't checked the Amiga titles). The store page says "powered by dosbox" on at least some, and maybe even all. You could also do a google search like 'site:gog.com/game "This game is powered by DOSBox"'.

edit: converted suggestions to links