Warrior

Strategy games where you command a force, action games where you're the one fighting, and one that's closer to a tactical puzzle. They share a theme rather than a way of playing.

Legions: Way of War. The important decisions happen before combat begins, so a battle is largely the consequence of choices you already made rather than something you steer.

Rift of Hell - Demons War works that way, sending waves that keep coming regardless of whether you have recovered from the last one.

Pace. It slows everything down so positioning and timing carry the encounter rather than reflexes, which puts it closer to a puzzle than the other two games here.

Yes, all of them run free in your browser with nothing to install and no account needed before you start, whether you would rather command or fight.