Its good to see new games for old systems. I hope this trend continues .
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If I were to embark upon a project like that I would want to get the most out of the system, and that's a whole lot of work. I'm glad others are doing it.
The unfinished c64 projects like My Day on the Highway or Spooky are I think where I would end up. Amazing but a final product never seeing the light of day.
That said, when it was too hot to sleep the other night I sketched out a tiled graphics system (16 and 23 written to $d016 on alternating scanlines) for the c64 because my brain will keep on working on things whether I like it or not.