FYI, all of their apps are on sale. Some are just a buck off but that's the case with a couple you listed so I'm assuming a sale is a sale to you. Even their newest one is on an intro sale, so you might as well just check the "best Kemco" thread(s).
It looks like they may be abandoning their occasional $.99 sales, which is a good thing in terms of them being able to keep on going. I'd like to see them get a bit more adventurous in their next endeavors. One of those is their first attempt at a 3D RPG and looking forward to seeing how it turns out.
While all of their RPG's have their own charms and decent storylines, they don't stray too far from the standard mold. I still enjoy them though.