sure, mono is quite boring on most tracks, but every mode eventually becomes monotonous with repeated play-throughs as the core strategy is the same.
not overfilling on those really fast songs is challenging though.
oh, on your vid you left the songs tagged the same even though you modified the ash...
Yes, but I prefer to have a song where I, lets say, collect 20 gray blocks and then try to reduce that to, like, 5, instead of a song where I collect 3 and try to reduce that to zero - I simply hate games where just one mistake ruins everything... I prefer Pusher in that aspect: You can keep the chain alive even if you make a few mistakes, it only costs you some 5-20k points. Since I can do that even on fast songs (280-380 traffic congestion), I can get good scores with Pusher.
You are right about the tags, btw... but I can assure you, all songs I have done this with so far had next to no competing scores, and those that were there were far below me anyway, so I really don't think it matters (with one ATB exception). There is a completely different problem, however: I have a few radio rips - these songs are identical to the original except that they are compressed, so there are probably more blocks. But this is technically not cheating, so I don't really care... also, the track preview is clearly different, so anyone can see it (and even in those songs there is no serious competition).
Ah and yes, Milkdrop is cool

, but I made mine in AVS - for me it is sort of the next best music thing after Audiosurf! There are a few presets integrated in Winamp even which look very Audiosurfish (abstract plane flies through abstract soundscapes).