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Yeah, teaser video's are ok and all (the cut-scenes remind me a little of the ones from the upcoming GTA Chinatown Wars for the Nintendo DS), but...
Add planty of varied locations/levels and enemies, and make it very platformy (is that even a word :o) in the vein of Super Mario and then I'm sold.
Hmmmm... interesting! Kind of reminds me of the overhead levels in Contra 3 on the SNES.