levels.
-you are plant dude. tap on the screen to shoot.
-shots pull flying bugs closer. shots push crawling bugs away.
-pull the flying bugs towards you and eat. yummy!
-eat all the flying bugs to complete the level.
-keep the crawling bugs away. push them against a wall to squash.
-you lose if a crawling bug reaches you.
-you lose if a flying bug reaches the wall and triggers the laser.
-shots are continuous. tap and release, or drag to sweep area.
-hit the bug bombs to squash many crawling bugs at once.
-shielded bugs cannot be pulled. squash all the crawling bugs to drop shields. 