Comment 12 for bug 133600

The .desktop and icon are not yet installed.
You need to add a call to dh_install, for instance after:

binary-arch: build install
        dh_testdir
        dh_testroot

You should change /usr/share/pixmaps/applications to /usr/share/pixmaps.
A minor point: the changelog should be made so that it is correctly visible over 80 columns. Please wrap the entries accordingly.
A little typo in the changelog: debhalper should be debhelper
In Debian its ok, but in Ubuntu some people do not like to have Section: universe/games and prefer Section: games
If you upload a new debdiff which correct these, you should subscribe u-u-s to find a sponsor for the upload.