I highly recommend "Undertale: Uppertale, an Unofficial Full-Length Sequel" as a great fangame. Apparently, Toby Fox actually helped on it. I guess he had to, seeing as how a ton of sprites from the original game were used. And music, too.

Here:s what's new: My backspace key is sticky. Meaning if I hit it it erases everything. I would hit it with a hammer, but keyboards aren't cheap.

I may just make my own damnable Undertale fangame. How 'bout...

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The only fan games that A: Work on Linux and B: were worth a fuck are all really short.

Undertale is amazing. Can't play it, broke. However: Fan games are a thing! Yipee!