Is or would it be possible to port/play classic roguelikes (like Angband, Nethack, ADOM, etc) to the Gameshell?
Never heard of these games before.
Nevertheless, I can confirm Angband runs on the GameShell:
But have to figure out how to scale it to the GameShell screen:
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what should i do to get it installed?
off course, some must be directly in bare debian repo
problem will be lack of buttons 
try execute them using xterm
xterm -e “a command line game”
you could also try my powder port
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Yeah, @r043v is right. The easiest way to install is to sudo apt install angband and run angband, but the scale is off.
Maybe you can somehow fix it in /home/cpi/.angband/Angband/x11-settings.prf.
some games may also adapt their display using the screen size in lines & columns
xterm also have bunch of option to define font / font size / lines & columns / background color
https://linux.die.net/man/1/xterm
here is a list of rogue like on debian > https://blends.debian.org/games/tasks/rogue