Cannons is a turn-based artillery game, the format that goes back to the earliest home computers and forward to Worms. Two cannons at either end of a landscape, alternating shots, and three variables to get right: angle, power and wind.
The first shot is a range-finder, the second is a correction, and the third should land. That rhythm is the whole game, and it's as satisfying now as it was decades ago.
Use your first shot as a range-finder, then change one variable — usually power — and watch how far the impact moves. Changing angle and power together makes the correction impossible to judge.
Yes, and it changes between turns. High-arcing shots spend longer in the air and are affected far more than flat ones.
Yes — a light 2D game with nothing to install.