it does looks like undertale title's font

Hi!

+1 (I second JingYo's opinion).

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“you cannot switch colors”?

→ IMO, the prolific Goatmeal is one of these 'fontstructers' that may help you add a few grays…
See e.g. his anti-aliasing in "SW Dark Katarn Pixel" (2010) and in "KQ5 Crispin's Magic Wand" (2010) ; or you can get his gradients in "Gradient Patterns" (2010) and in "Alex Murphy Gradient" (2010-2011), even pick a few Pixel Art effects in "QFG4 The Elements" (2010), and in all his related little masterpiece of compilation / collection: "The 1st Six Yrs 1of6" (2010), "The 1st Six Yrs 2of6" (2010-2017), "The 1st Six Yrs 3of6" (2010), "The 1st Six Yrs 4of6" (2010), "The 1st Six Yrs 5of6" (2010), "The 1st Six Yrs 6of6" (2010).

Bye!

 

Good antialias/simulation! always fun :-)

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You did well. Actually, the comments on our font pages are simply linear (no advanced/complicated indentation etc.): the FontStruct members often solution this by beginning their post (= comment) with "@" ('at') + the recipient(s), so that this first line (pseudo-header) can be easily spot in the Live page. E.g. “@dpla: […]”. Besides, the related persons can be contacted privately from their profile (“contact” link), e.g. Goatmeal's. Only the page author can delete his/her posts (the other 'commentators' might ask the FS maintainer (e.g. via “@Rob:”), if it's important, e.g. hidden and ugly spam).