Five Nations is a real-time sci-fi strategy game for PC platform. It's an indie game developed and published by SilverForge in May 4, 2021. Encompassing tactical combat in space in real-time mixed with micromanagement of economy, construction, and production featuring different kind of single player modes.
The system requirements are lightweight; nearly any modern laptop will work for playing Five Nations.
The RAM requirement of 4gb is easily met.
Also, note that at least 1.5gb of disk space is needed.