Wasn't sure where else to put this, hope it's okay here. Anyways, NegaPosi*Continues makes a lot more sense if you watch one sasakure.uk's other songs, Rainbow Colored*Adventure. http://www.youtube.com/watch?v=mnG1Lsy_aak I know she's playing a video game in NegaPosi, and it seems like she's playing that song. It even ends with the tune that plays at the start of RC*A. Just thought it'd be sorta neat to point out, since I love his music.
Yes, that album (Do Vocaloids Dream of Doomsday Bird) is amazing, particularly if you enjoy chiptunes. Although I can't speak for NegaPosi*Continues, all of the songs in that album (including Rainbow Colored*Adventure and Hello Planet) listen well together and contiguously. You will detect quite a number of overlaps in melodies used in order to tie the album together, much like in the genre of symphonic progressive rock in which, often, the album tells a story told in pieces by each song.