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1)  You probably don't need (RainCT) in your changelog.

2)  You'll need dh_desktop in the rules (see https://wiki.ubuntu.com/MOTU/Packages/DesktopFiles

3)  You don't need to note so much in the changelog.  Added an icon for flobopuyo (LP: #117156) is sufficient

4)  Consider adding an icon=/usr/share/pixmpas/flobopuyo.xpm line to the menu file.

5)  If it's not already there, you might need /usr/share/pixmaps in the dirs file