If you want a browser game that is easy to start but still gives you a reason to stay for more than a minute, Gunwars does that job well. The gameplay usually centers on aiming, movement, and constant pressure from the next threat
It also benefits from the kind of design that works well in a browser tab: quick restarts, a clear goal, and enough pressure to make improvement feel real from one attempt to the next. This kind of browser game works well for players who want quick access, short sessions, and enough challenge to stay engaged.
Start with the basic controls, follow the main objective, and pay attention to how each level or round changes the pace. The mechanics are approachable, but playing a little more carefully will usually produce better results than rushing.
In short, Gunwars fits casual sessions well, but it also has enough structure to keep competitive or improvement-focused players engaged.