Dude your prices are exactly the same as official Steam store. Not to mention Superhot for example which you can get from G2A for about 4euros
Well, I did use the (on-sale) steam prices as guidelines.
I'm not trying to compete with keys from questionable sources on G2A - in fact I believe G2A/Kinguin should be avoided by anyone who loves PC/Indie games because of their scummy business practices but that's just my two cents.