The Boobeam Trap is an enemy from Rosenkreuzstilette Freudenstachel.
The trap appears on the screen and will periodically fire lasers capable of killing the player instantly if touched. The Boobeam Traps can be destroyed after taking enough damage, but it is quicker for the player to simply skip them. They are based on the the boss of the same name from Mega Man 2, but unlike their inspirations, their defeat is not mandatory to beat the level.
They only appear in the first stage of Iris Palace II.