play Galaxy Fraulein Yuna 1 and 2 on the PC-Engine CD
they're fairly short and fun

you use linux so it shouldn't be too hard to figure this out
install mednafen (emulator) and mednaffe (GUI frontend that makes mednafen much less of a pain in the ass)

first game patch:
http://stargood.org/trans/yuna.php

second game patch:
http://stargood.org/trans/yuna2.php

you'll need wine to use the provided batch files and tools, run wine cmd while in the folder and then run the batch file
or just do the patching on a Windows machine lol
CD game patching is always kind of a hassle vs just "here's my rom, here's an IPS/BPS" but it's not that hard.

the game images can be found here:
https://archive.org/download/nec_pc-engine-cd_turbografx-cd
first game is
Ginga Ojousama Densetsu Yuna (Japan) (FAAT, FABT, FACT).zip
second game is
Ginga Ojousama Densetsu Yuna 2 - Eien no Princess (Japan) (FABT).zip

these are "split bin" releases when following the instructions, I have never seen the non-split ones

emulator BIOS:
https://archive.org/download/nointro.tg-16
[BIOS] Super CD-ROM System (Japan) (v3.0).7z
extract it and mv the .pce file to ~/.mednafen/firmware/syscard3.pce

these aren't exactly groundbreaking games to a modern VN player, but they're cute, short, and very entertaining and I wanted more when I was done (＾Д^)
the production values are excellent and they're considered fairly classic by the nihonjin

and Yuna is so cute... (*´人｀*)