Technically, the Baroque era (Baroque = Misshapen Pearl, named in the classical era because they thought the music was terrible) is defined by it's ability to define a single emotion very well (as opposed to later eras using multiple emotions to contrast one another in a single song). It also uses many 'inventions' and preset techniques to get more sound out of their instruments (like heavy use of polyphonic lines). From my own experience, the rhythms are often restricted due to this, but that's just what I hear in it.
The columns track uses very heavy polyphonic lines. Very baroque technique.
Atelier uses a harpsichord and has that nifty polyphonic line in it. I'm also hearing some heavy use of sequences - other eras use sequences too, but Baroque tends to use it without masking the sequence at all, like in this song.
Sam and Max wrote a fugue (or at least imitated one). That's pretty hardcore Baroque, there. Tonal fugues really weren't written often after that period, so they tend to sound 'Baroque'. Also, HAHAHAHAHA, Deis Irae at 1:38. I wrote a whole article about that in my good ol' theory thread . That... doesn't point it to Baroque, per se, but it's always fun to point it out whenever I hear it.
Good ol' Zircon uses those polyphonic lines and some rich counterpoint reminiscent of some of Bach's works. Particularly holding the bass while having the lines move above it, creating the illusion of chord changes. Very Baroque.
Dance Dance Revolution is a remix of one of my favorite Vivaldi tunes,
. It is baroque, by definition. Go listen to it and tell me if you recognize it.Castlevania overuses the whole polyphonic lines thing + counterpoint over a static bass. God bless their hearts.
Hopefully that answers your questions about it all.