I don't know the reason why our game is not available anymore for purchase and why our servers are shutted down by Steam.
I've created a ticket in dev support, but it will take some time to sort this problem out.

In worst-case scenario we will migrate to GOG with our own master server.
Some good news, I almost finished a new map. It will be a Saturn's moon. The only problem left is to teach bots to use the jump pads ;)
And of course new update means sale, so if you going to buy this game, wait for a while and buy additional copy to your friend as a gift.

See you soon, spacemen.