Nice little game, here are some of my feedback:

• Players can hold down the button to attack continuously, if this is not what you want, you can use poke(0x5F5C, 255) to turn it off
• Maybe add some buffs, such as time slowdown or health recovery, sometimes when a bunch of excavators appearing from the other side of the screen, it's really hard to defend perfectly
• End the game with a boss? >:)

P.S. This game is named "I'm Making a Goat" in Russian XD