(via Gilcrows) Today Mikku Man X, a platform doujin mashup of Rockman and Miku chan, has been released.  This doujin game is pretty fun (among the enemies there is even Morrigan!) with a solid gamplay and great soundtrack (no Vocaloid 2 songs but a great arrangement of the original Rockman theme).
You can download the file here (but be patient since the server is overloaded with requests and it's not easy to download the zip).

Updated: I just found the file mirrored here (the link appears as an on-screen comment at 7:08 in the NicoNico video) .