Before thinking I completely recommend this game, hold on for a second and read ahead.
TLDR: Please play the game... But not on Steam
ClaDun x2 IS a fun game. It's exciting to play, has good music and the customization options are through the roof.
Under any normal circumstance, I would recommend this game, but not in this scenario.
20 US dollars is not what this game is worth to any normal player. I would recommend this game on a sale, but there's one problem with that; The publisher has abandoned Steam. There is most likely never going to be a sale for this game ever again and that's the sad part. I want to tell my friends to buy it. I WANT to let others have this on their library, but 20 dollars is WAY too much, especially considering that it's not very well ported. There's flickering with the Steam Overlay and is generally a pain, but I had loads of fun.
I cannot recommend this game for 20 dollars.
I recommend getting the PSP version, whether it's emulated or not is not my choice.