The Catapult 2 : bone masters

This is a challenging portrait-oriented artillery shooter with short, interruptible sessions that can be played solo. While it offers high replay value and can be played offline, progression is heavily gated by expensive upgrades and difficult enemies, pushing towards a pay-to-win model. It's best suited for players who enjoy a demanding, intense experience and don't mind a steep difficulty curve or potential pay-to-progress mechanics.