See here:

https://www.humblebundle.com/

6 days +change left.

+++ Race The Sun
++ Hammerwach
++ Gunpoint
+ Papers, Please

--- SteamWorld Dig (unusuable controls)

Haven't tried yet:
Prison Architect
Luftrausers
Monaco
Gone Home
The Bridge

Race The Sun is a blast. I picked up the bundle, but I haven't tried the rest of the games yet.

Prison Architect probably makes the entire pack worth getting if you like city builders, the Sims, Theme Hospital, or Dungeon Keeper. Still Alpha, but definitely very playable right now, and $10 is a great deal.

Gunpoint is fun and funny, but the storyline only lasts a few hours (3-4). I haven't tried additional content in the form of modded or custom maps.

Hopefully you're not talking about "Dungeon Keeper Mobile"...

No. Original. :p