You probably saw the "Add to your wishlist" message several times here on Steam. But what are all the developers asking it for, should you click that green (or blue) button, what is it?
You can add the game to the wishlist right here:
https://store.steampowered.com/app/1201700/Warnament/
Or you can do it on the game's page just under the video trailer, like this:

If you have a game on your wishlist you will:
You can always remove the game from your wishlist.
The developer will know nothing about players who added the game to the wishlist. No email, no account name, no ability to send you a message - nothing. The only thing visible for the developers is the total number of wishlists
This number is a thing that can help the developers understand how much players are interested in the game, and how many additional features and level of quality they should consider to work on.
If you are interested - consider adding the game to your wishlist right now, it's like hitting the subscribe button on social media.
If you are not sure yet (or you waiting for the discounts) and want to see how the game is being developed to decide later - adding to the wishlist is the best option to tell Steam algorithms that you want to be aware of news and updates from the developer.
https://store.steampowered.com/app/1201700/Warnament/
P.S. If you want to talk to developers directly, suggest some features, and get more involved in the making of the game - Discord and Steam Discussions are great for that. Or let's chat down below if you have anything to discuss!