I found
this review for it. I thought it was nearly as stunning as the game. It's exactly how I would have put it. I'll just quote the last part:
As a free piece of software, the original Cave Story gets a perfect ten. This not-free, enhanced port gets a...
Score: 9.5 - Superb (9s are a hallmark of excellence. There may be flaws, but they are negligible and won't cause massive damage to what is a supreme title.)
The graphics still look a bit funny, but that's partly because it's such a big screen compared to my laptop, and partly because even though there's a higher resolution, there's the same number of frames to all of the animations. You'd think Nicalis could have added a few more to make it more fluid. The more detailed the graphics are, the more choppy it seems.
Also, I was personally disappointed with the new music. However, it lets you switch between the new graphics and old ones, as well as the new music and the old music. I think that the old music is as much of a work of art as the game itself. You have to load one of the .org files into Orgmaker to fully appreciate it. Just try following a few of the tracks. Then imagine trying to put it all together.
Now that the game is out, hopefully Ravenworks will be able to get back to work. Personally, I'd rather have a handheld version than a wiiware one, and not just because the handheld would be free.
As for twelve dollars... meh, that's an awful lot of money for something that was free to begin with. I'd say it's priceless, but that doesn't mean I want to pay a bunch of money for it. Well, either way, they still got my $20. I just bought it about a half hour ago.
(Probably facepalm for asking this, but what's DLC?)