This is not a bug, there are 2 spheres at level 7. You need to find them all. On level can be up to 5 spheres.
Return unnecessary copies of the game before it's too late, they're all the same.
Yes, my page was blocked. I don't know if it's temporary or not, but I've already written in support of them.
Anyway, a couple of months ago I created a page on Boosty. This is an analogue of the Patreon, and I will be glad if you switch to Boosty.
Also on the Boosty you can subscribe for free. You will not get access to paid content, but you can follow the news.
The posts on the Boosty and Patreon are the same.
Unfortunately, your graphics card does not have enough memory. But in steam, users have found a solution: https://steamcommunity.com/app/1656680/discussions/0/3052862273805579754/.
Use at your own risk.
Perhaps you are missing some components for windows. Try to install the game in Steam of any major publisher, for example, Ubisoft. Before the first launch, such games usually automatically install everything that is needed for games. This is the easiest way.
If all else fails write support for itch.io about the refund.