The description says it is earned after buying all artifacts but it unlocked for me after buying just one, even the in-game achievement turned gold.

I made all the achievements why it does not appear to me as a perfect game in steam

In 2018, I bought some keys for this game. The unused ones aren't valid anymore. I have no idea how you as the developer distributed them precisely, but for example these are two that didn't work now: NJTEN-0I7AK-63WE3 QJW4M-KAVXZ-BQ845

I have been playing the game on my laptop running windows 10 , intel hd 4400 it seems to heat up the system a lot , i was looking at the fps counter its throwing crazy numbers above 300 fps , is there a vsync option for the game ?