Pixel Expedition : Survivor.IO

This is a solo, intense action roguelike played in short, interruptible sessions, likely in portrait mode. While it offers high replayability with loot-driven progression and fun builds, progress can be painfully slow without spending money due to an energy system and pay-to-win elements. It's best suited for players who enjoy challenging, fast-paced gameplay and don't mind a grind or optional monetization.