Are proprietary games welcomed?

I was interested in implementing and submitting a PR for these two games:

* No Thanks! — VERY simple mechanics.
* Mamono Sweeper — a basic extension of Minesweeper, where instead of each "bomb" being a simple binary yes/no, each "bomb" has a value from 1 to 9, and you "level up" over time and are able to clear increasingly more powerful "bombs". Even though this seems like a radical departure from Minesweeper, it still plays mostly the same.

However, both are proprietary (e.g. No Thanks! is published in English by Z-Man Games). Are these types of games welcomed to be submitted via a PR?