Update: Switch. It's coming to the Switch.
Materia Collective
 @MateriaColl
12 Mar 2018
UNDERTALE's coming to Steam! Did you grab the soundtrack on vinyl yet? store.iam8bit.com/products/u…

Mar 12, 2018 · 6:32 PM UTC

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Replying to @MateriaColl
When I saw that original post I was thinking, "Did I dream that whole experience? I could have sworn I played through Undertale on Steam...". This makes more sense.