As of today, Undertale passed the 1m mark on Steamspy: http://steamspy.com/app/391540

Since it's also available on the developer's own website DRM-free, and the soundtrack and merchandise are for sale, I'd estimate >$15m in revenue so far for an essentially 1-man game (he did the design, programming, soundtrack, and some art). 

Suck it, indie haters.

Wow, that's impressive. Not let's see which console gets an Undertale port first.

I'm not surprised because the game is very popular, but that's a great achivement regardless.

I'm one of them. Haven't been able to get into it, but maybe it'll manage to grab me later, when I try to return to it.

I don't think it would pass certification due to a certain mechanic. Also, the engine doesn't export to Nintendo platforms which would be the most obvious target.

very cool, I hope he gets the chance to direct a bigger scale game and infuses it with his game design philosophies

directing obviously is very different to doing everything yourself though

I would love if if he just did game composing. The state of modern game soundtracks is depressing.

Nice. Toby Fox is partying it up.

Vita duh! :p