合成 Aster
左右瞄准，点击投放。两个相同印记合成下一级。
Merge Aster
Move left and right to aim, then tap to drop. Two identical seals merge into the next one. Reach Aster. Cross the red line or run out of time, and the round ends.
- Each round is limited to 10 minutes
- Only the first five small seals drop at the start
- Two Asters that collide vanish and score extra