I think this is a wonderful idea. I've thought about local bookstores selling independent games, but really this is much more appealing.
I don't imagine anyone would be threatened by having their freeware games get distributed to more people. Just get permission first. I'm sure most developers would be happy to participate. I think commercial developers would feel otherwise, which is unfortunate.
It would be nice if the lending were done in a way that encouraged word of mouth recommendations. I also think it would be great if you made a point of distributing some games that ship with editors. You could also discretely slip a few programming tutorials into the shelves
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