WASD to move. HOLD left mouse button to shoot. Map is randomly generated from the building amount and which type of building, down to the tree and bush. There are four enemy types that appear as you progress in waves, and spawn sooner the better you preform. There are also bear traps and pit falls that will spawn more frequently as you reach higher and higher rounds. Hard mode unlocks all enemy types to spawn from the very first round, and gives the game a base of 10 traps to spawn at any wave, which will increase as you play on.