UPDATE: First set of files has been released (license CC0) and on my advise he added some stretch goals:
Currently it is standing at 530$ and there are 22 days to go, so chances are we will see some more nice stuff out of this.
600$ > 3 game ready Enemies! (models, sfx, animations, effects)
650$ > Dynamic optimized lighting system! (rich dynamic lighting with low resource usage )
750$ > 4 new weapons!(model, texture, sound)
850$ > Triple the amount of the actual props! (interactive objects,explosibles, new walls, doors windows etc.)
900$ > New player model (model, textures)
Way too many closed-source game projects never see the light of the day, and their code and assets are forever lost. Now at least one developer thought he could at least make a few bucks by liberating this content under the CC0 license:
There is some seriously nice stuff in that pack, and the 500 US $ he is asking for on his indigogo page is a bargain for it.
But I sure wish more developers of failed projects would release their assets like this.