On SmileBASIC? I'm not really sure. I just downloaded it, but I never tried it yet. I'm also new to programming in general (I've been taking classes but that's it). I remember hearing that it has the same power as an SNES. Someone made a Megaman 2 clone on the Dsi version, and I saw that someone made a mini Touhou clone. So graphics-wise, probably not depending on your definition of HD.