We build in the order customers ask. Most things on the roadmap started as a ticket.
Ask
Ticket, category General, subject starting with Feature:. Say what problem it solves for you, not just the feature. "I want to pause my server over the summer without losing the days" is more useful than "add a pause button". If others asked for the same thing, we say so and it moves up.
New games
Name the game and how many people would play. If a few people want the same one, we install it on our real hardware, test that it runs (we did that for Valheim, Palworld, 7 Days to Die and Satisfactory), and add it. Some games cannot be hosted on Linux servers or need licences we cannot get; we tell you honestly.
What we say no to
Things that would hurt other customers (unlimited CPU, mining), things that need a second continent, and things that only one person needs and that would take weeks. Everything else is a fair question.