Oh, that's a fairly old short. It popped up on ANN and Sankaku when it was first released, so it was pretty common in conversation for a while.

Well, as for other small-scale works, I'd point you to Cencoroll. Though you've probably already seen that.

Other's would be Life no Color from GodxDog (The studio whom I got my sig image from). Their studios website is no longer up, but iirc there were like 3 dudes in the studio. I dunno if all of them worked on Life no Color or what.

Then from Romanov Films, there is URDA (and Catblue Dynamite). I'm pretty sure it was just 1 or 2 guys who did URDA. But I have no idea on Catblue.. Because it was a much larger production :\

Of course there's all the things from Yasuhiro Yoshiura. His 2 short music videos, Aquatic Language, and Pale Cocoon (I won't add Time of Eve)

There's the Iron Vendetta project that's in production and I hope we see soon. At least it's something to look forward to.

There's that Kowarekake no Orgel doujin work that most of the sites don't list because it's doujin.. As well as that Meguriau ​Sekai​ ova that is treated the same way.

I could link you to a lot of cool anime shorts from Studio 4°C, but those aren't really "independent" :\

Hope I mentioned something that's new to you.