Another short level, and an attempt at some kind of boss.
Monsters spawn constantly for two minutes, and you must break all four pillars (or veins, whatever) to destroy the heart, get the key on top of it (to open an exit) and escape. Fail to destroy the heart in two minutes, and 300 enemies will make sure you do not get out alive.
It is rather hard, as you are always followed by monsters. I softened the level a bit by adding a health pack at 0:30, a triple shot at 1:00, another HP at 1:30, and a sword at 2:00 (just for the lulz, you wont beat the 300 monsters).
PS: I will remake this level with zerglings once the creature editor is released :P
PS2: why do I always forget to add music? :(