Asteroid Shield: Tile-Matching Space Defense

Create your own defense
Combine 3 items from the same resource to upgrade them into weapons or defenses. If there are 3 similar weapons or walls nearby, you can combine them to create more powerful blocks.

You have a limited amount of swaps before the asteroids appear, so use them wisely. Position your defenses to withstand the attack! On the 10th and 20th day, the main asteroid appears. After the main asteroid is destroyed, it will break up into many smaller asteroids.