Really great idea. I hate that there is no rating system on the console so this will be helpful.
I haven't finished much indie games cause i don't have much time to even finish the big games but i can say :
Shovel Knight : 5/5 (maybe more 4.5 but anyway ^^)
Oxenfree : 4/5 (i would recommend it on sale tho cause full price i would probably put 3/5)