Yes, Nova 2001 is very marathonable. I think the score maxes out at 9,999,990, but I lack the patience to do it...(posted 9285 days ago)Yie-Ar Kung Fu can be marathoned if you have the patterns down too, but I've had difficulty getting past 2nd Tonfun. Since nobody's been able to keep going on it for too long I think it should be left alone for now.
As for Mat Mania / Exciting Hour... I'm all for reducing the length of games, but how? I'm not 100% sure but I think even on Hardest difficulty, once you have "the pattern" down you can just keep going until you eventually screw up. Remember, you have only one "life" on the game, once you're pinned that's it.