There are multiple types of enemies, each with a different behavior pattern. At higher levels, some enemies place spikes in the middle of the lane. These spikes travel toward the player and destroy the player's ship when the player warps out to the next playing field. Other enemies travel towards the player's end of the playing field while firing at the player, then flip from lane to lane, killing the player if it moves onto the lane that the player is on. Firing while this type of enemy is changing from an adjacent lane kills it.