Recently, I had a brief email discussion with Yann surrounding the update to the Cave Story WiiWare soundtrack. I'm sorry to say that the software player wasn't really ever fixed, the game's just playing low-bitrate OGGs now... so yeah, kinda annoying, seeing as the limitations the songs were designed to work so well within were ultimately thrown out the window. Still, it's way better than how it was before!
Most of the tracks are better than original
A bold claim! I have a huge appreciation for Cave Story's original soundtrack. That said, I feel that the tracks Balrog's Theme and Living Waterway have been noticeably improved. I also love the new Geothermal, but I loved the old Geothermal too, so I couldn't possibly choose one over the other. It'll be hard to decide which soundtrack I prefer (or if I
them both equally) without many more listens and hopefully seeing the songs in their proper context... if the game is ever released here.
As a final note, I'm not a fan of the decision to use a loop from that Cave Story remix by tumult for the title screen music, though I doubt you two had any input there. Some strange decisions made for this game...