I liked Harmony of Dissonace the best because I got farthest in it.
I've been looking for Astro Boy: OF, but Treasure, oh boy. I watched this youtube video on hardest games the other day and Treasure was mentioned a lot. Also that F-Zero game you mentioned on GameCube was named hardest for that system in this vid. I was happy to at least see some gameplay of it.
I've played some Drill Dozer on a collection somewhere once. Interesting game.


