I did a bit of digging around and found some keys in previous bundles I've purchased. I'm not sure if they're used so I won't put them in the first post but I have keys for the indie arcade games:

Vanguard Princess
eXceed - Gun Bullet Children
eXceed 2nd - Vampire REX
eXceed 3rd - Jade Penetrate (Black Pack)

But I DEFINITELY have spare Steam keys for the games:
* Ether Vapor Remaster
* Heileen series

I won't update the date since this isn't really a new bundle and I want to get rid of these old keys anyway.