Did you set the section the package is in as "user/games" or whatever? It has to have "user" as one of the categories/sections, or else Hildon Application Manager (and FApMan, unless you select the advanced display option to show ALL packages) won't show it.

It was designed that way as a way to keep end users from doing stupid ****, namely installing some random library because it sounds cool, without knowing what it actually does.

Other than that, I haven't installed it yet, but screenshots look great. N900 greatly benefits from more games, definitely - great to see someone porting one.