Hydro Storm 2 is combat powerboat racing from Xform Games: you race across water in an armed boat, using primary and secondary weapons on rivals while trying to hold the racing line through the wake and chop.
The water makes it distinctive — your boat is affected by the waves and by other boats' wakes, so the racing line is never quite where it was on the last lap.
Waves and other boats' wakes push your boat around, so the racing line shifts constantly. Staying out of rivals' wakes is as important as steering well.
Yes — a primary and secondary weapon on separate keys, used to slow or disable rival boats during the race.
Yes — it runs in the browser with nothing to install.