My mini-game idea so far!

Right, the concept of my game is:

There are 2 cannons, that 1 player will control each cannon. Once clicked on the cannon, both players will have to select start game, then the HUD will show up.

On the HUD there will be 5 buttons, rotate the cannon left or right, raise it up or down and fire.

The players will have to aim the cannons at a target and fire. If the player hits the target, their score will raise by 1. Once a player destroys the target, they will move to a different location to be aimed at once more and shot at. Rinse and repeat until game is done. At this point, I'm not too sure on what the points should go up to.

Once the game has ended, a scoreboard will appear with both players names, score, hit%(maybe) and whether they want to rematch or leave the game.