I was looking at a few guides for Bound and they all give it a 10/10 for difficulty to obtain the platinum which is quite rare as even most hard games still only usually get a 8 or 9 :)
I didn't realise Alone With You was so cheap and at £7.99 I will have to grab it :) - It's cross buy as well and has 2 seperate lists for PS4 and Vita it seems so if its great I can get the plat twice :D