I am, but quite a lot of them have been fixed in git...

Also, PR1.3 might break a few things... I planned to push 0.1.1 today but I think I will wait until tomorrow for PR1.3 to settle.

Removing a game's icon from the menu: You currently have to read the appinfo.json from that game; there will be a line that reads like:
(where gamename, etc. is of course the real game's info)

You'll have to find a file named like that ("com.gamemaker.gamename.stuff") in each of the following directories:
/usr/share/applications/hildon/ (with .desktop as extension)
/usr/share/dbus-1/services/ (with .service as extension)
/usr/share/icons/hicolor/scalable/hildon/ (with .png as extension)
thus, total files you need to delete = 3

It is important that you do this if you plan on remove or upgrade a Pre game. The next version will come with a program that will undo whatever desktopgen does, but unfortunately, it might not be able to delete files created by the current version of desktopgen (as they're invalid).

In fact, if you think you will not be able to delete the files by yourself I suggest you refrain from using desktopgen as it is in the current version.

Next version will clearly mark preenv generated files as such and you will be able to uninstall all of them by just uninstalling preenv.

Sorry for the inconvenience!