RTS Siege Up! - Medieval War

This is a real-time strategy game playable in portrait mode with simple controls, making it suitable for one-handed play and short, interruptible sessions. While free-to-play with optional purchases, it offers a fair experience with no energy timers and good replayability through its campaign and map-building features. It's a good choice for players looking for a relaxed yet complex strategy experience on mobile that doesn't demand high-end hardware.