Tower Defence Game

This is a simple tower defence game with only one level. There are two kinds of enemies and two kinds of towers. The pink enemies are weak enemies, and purple enemies are stong ones. The yellow tower is a miner that will produce extra golds and slow down enemies  close to it. It can be placed on blue areas. The green tower is a shooter which will hit enemies in its range automatically. It can be placed on  semilattice bricks. There can be five towers at most, and by doing a double-click on the tower, it can be destoried. Blood remaining will be shown on the upper left corner. The sign at the lower left corner can restart the game