Nice list. Gravity Rush is really great. I have the PS4 remaster. It did get a physical release but it was an Amazon exclusive in NA and kind of pricey now. I bought an Australian copy on eBay a while back.
I looked at a variety of sources when picking out what I bought on the PSN. I was just concerned with PS3 and I could not find a definitive list of digital-only titles. There were two Reddit posts that helped me out a lot.
https://www.reddit.com/r/PS3/comments/m ... c_updated/\
https://www.reddit.com/r/PS3/comments/6 ... ames_list/
Tekken 5: Dark Resurrection is one that I also need to get eventually. There is a physical PSP version but the PS3 version is digital-only in NA and widely considered the best version of Tekken 5.