There are a couple of different "mouse" coasters. The "wild mouse" type rides were coasters that were similar to twisters, except that they used slower speeds and very sharp, tight (and unbanked) turns. (There was a "wild mouse" in Wildwood, NJ, which I absolutely loved as a kid and almost fell out of). Lots of these coasters were torn down, because the fast, unbanked turns were very rough, and some of their safety records weren't so great.
These new "Mad Mouse" coasters are different (and some people still call them "wild mouse" rides, although they're not exactly like the old wild mouse rides). They are slower and unbanked, but they tend to have sharp turns with a very regular, serpentine layout. IMHO, they're very boring compared to the old wild mouse rides. They have individual cars (usually one 2-row car) like the old wild mouse coasters, too.
I don't know if anyone "official" has defined it anywhere, but I've always thought of space mountain as more of a twister - its turns are banked, and it crosses back and forth on itself frequently. It uses multiple cars chained together (yes, only 2, but wild mouse coasters used individual cars). It does seem to have some (old-fashioned type) wild mouse features, though. It's turns seem sharper than the average twister, and its drops seem more sudden. But they might seem that way just because of the darkness.
Anyway, the new Mad Mouse coasters just aren't very good (IMHO, as always), and this looks like one of them. I hope spinning helps.
Gary
P.S. Just checked americanmidway.com - they define Space Mountain as a "steel twister, enclosed". I didn't see anything on ACE.