Game rules:

1. The goal is to prevent the enemy ships from reaching the 'asteroid belt' (red zone).

2. At each turn, you can drag and drop one of your friendly ships within the bottom two rows.

3. Once dropped, each of the friendly ships tries to shoot up within its column.

4. If a friendly ship hits an enemy ship, it reduces the enemy's defence by its attack.

5. If a friendly ship hits other friendly ships, the one with the highest attack gets placed in the special cell on the side, from where it can also be dragged and dropped somewhere onto the bottom rows.

6. If a friendly ship gets dropped onto another friendly ship, then: they either swap places if they have a different attack, or you end up with a ship with double the attack.

7. There are 4 types of enemy ships: the regular ship, the destroyer, the mother ship and the small ship. The mother ship is particularly dangerous: when destroyed, it spawns three small ships.

8. Your resources ('ore') are depleted after two ships manage to reach the red zone. In particular, if a ship ends up on the row just above the red zone, you will automatically lose on the next turn, whether you manage to defeat it or not.

Latest updates (in reverse chronological order):

• Slightly increased the chance a friendly ship gets spawned;

• Added shooting animations;

• Expanded the grid and added a bit of padding to the right-hand side.

Used the Sci-fi Space Shooter asset bundle for the graphics: https://gamemaker.io/en/blog/sci-fi-space-shooter.