This is the way I played it with my friends:
- one void piece starts in the center as showed in the screenshot.
- if a piece touches the edge of the table that slot is invalid.
- every third turn (white black white* black white black* white black white*) a new void tile is placed by that player somewhere on the map after the player makes their move.
- nebula and asteroid tiles are placed before a game starts mostly in clusters. I'd suggest giving each player a number of those tiles they can place. I suggest 6 asteroids and at least 9 nebula each, but this number can be changed.
Ever since then i've been thinking about reworking the rules or changing things around but laziness has kept me from doing so. Nebula tiles have a script that automatically delete the item after it's flipped.

I have

I didn't really put a lot of thought into the rules or way it's played, I just came up with the pieces and used screenshots to show how you use them.

ok thanks.

but the voids are placed every 3 moves. (counting both players)

The nebula tiles delete themselfs after flipped, the voids are placed by the players after their regular move.

The game looks very interesting but I'm not quite sure what the nebula or void tiles do, or how they're placed.