Boxing Fighter is arcade boxing at its simplest: two keys, a health bar each, and a fight that lasts under a minute. Swing, block and counter — there's no combo system to learn, just timing.
The characters are cartoonish and the fights are quick, which makes it a good pick-up-and-play game and a decent one to hand to someone who's never played anything on the site.
Counter-punch. Blocking an attack and hitting immediately afterwards does more damage over a fight than trading punches, because the opponent is open after their swing.
The core game is against computer opponents of increasing difficulty.
Yes — a light 2D game with nothing to install.