I found a coupon code for additional 3% off at Gamivo "3ForYou" its only 3% but they have few pretty good deals.
Human Flat Flat $2.1
https://www.gamivo.com/product/human-fall-flat
Green Hell $10.49
https://www.gamivo.com/product/green-hell-1
Doom $4.9
https://www.gamivo.com/product/doom...