Drawbridge Keeper — free browser game

You operate a drawbridge connecting two banks. On the road above, cars come in two lanes (right-going on top, left-going below); below in the river, boats arrive from both directions. The bridge has two states: CLOSED (deck horizontal) lets cars cross but blocks boats; OPEN (deck raised) lets boats pass underneath but breaks the road. Space, Enter, clicking the bridge or the 'Toggle Bridge' button switches state; opening and closing take 0.6 seconds during which the bridge counts as neither fully open nor fully closed — no vehicle should be in the gap during the transition. A vehicle in the wrong state crashes and ends the game. Score +1 per car or boat that exits the screen safely; vehicles arrive faster as the score climbs. Tip: read the incoming traffic early, don't toggle unnecessarily (each toggle leaves you exposed for 0.6 s); if a car is already on the road while a boat is approaching, let the car cross first, then raise. When two opposite vehicles are racing the gap, prioritize the closer one.