Video Game Worthy
This is one of the greatest flash games I've ever played. The gameplay is amazing, and runs at just the right speed to avoid the break in action that some other RPGs suffer from. The graphics are top notch (although some of the cutscenes between areas could've used a little work). The music sets the tone perfectly, and I was impressed by the fact that you actually incorporated voiceover (though Sonny himself seemed a little too softspoken). The storyline flowed smoothly, I just wish there were more of it there.
If you addressed all of the issues that you already mentioned in your Author Comments (mostly adding more storyline and reducing Exp Grinding), than I think this game could easily work well on the Nintendo DS.