ToastyFrog said:
While I like Klonoa games more than a heterosexual male ought, Moonlight Museum isn't worth the price. It's basically the same thing as Empire of Dreams but nowhere near as good. That being said, it's decent enough.
Moonlight Museum is far more of a puzzler than any Klonoa game before or after, so I'm gonna have to disagree on the EoD bit, whose sole idea of a puzzle was that "yeah, yeah, it's a GBA game so we have to demonstrate that there's hardware sprite rotation in here" room. Some of the levels in MM actually had me stumped for a couple days.
Other than MM, my choice for top Wonderswan game is Engacho, which also heads the list of greatest puzzle games that (1000 pardons for the cliche) no one ever played. It's a brilliant Theseus and the Minotaur clone with character designs by UrumaDelvi. Very English friendly. Play a Java demo at
http://engacho.nac.co.jp/Game/game.html and go nuts for it. There's a PSX version as well, but puzzlers love to be portable.
On the color tip, your opportunities start to dry up. Rhyme Rider Kerorican is outstandingly average and ultimately forgettable. The XI game is actually pretty nice, and is also actually color -- it looks pretty sharp on a Crystal. DicingKnight.'s probably the most playable of the Crystal games I've looked into, but it's crazy rare, and probably not worth picking up what it'd cost to track down at this point. If you can find it for near the 4,000yen original asking price, go for it, but I paid fairly well over that for a pre-order, and those cleared out with the quickness.
Your best WS investment would probably be a headphone adapter -- I still haven't sucked it up to plunk down the $25+ for the attachment, but that speaker is an atrocity, and your Swan Volume options otherwise are
REALLY EFFING LOUD, PRETTY LOUD, and off.