Suggestion: consider adding the game to https://itch.io too, they even have a feature to easily tip the creators.
It’s a giant platform for indie games with almost 100k games already and almost 13k Linux games, most of them free and people can donate and support creators, or you can put a “pay what you want” price starting from $0(free) and can you choose the amount you pay back to the platform:
Since March 2015, itch.io has an open revenue sharing model. Sellers can now apply the pay what you want model towards itch.io: the revenue split between the seller and itch.io is configurable by the seller. Set it to 10%, 30%, or even 0%.
You can set up a page there too, describing the game, put some screenshots and videos and receive feedback from the community. There’s an AUR package with their game store, it’s similar to Steam, the package is called