Asyou have to unlockdoor. To do that you need to find 3 buttons marked with big dicks. They are protected by a few monsters. Don't worry, you cannot perish but when they are going to capture you you'll have to start from the start. Use Arrow keys to move.
Our heroine is kinda locked from the dungeon that is subterranean. I figure she needs to find an exit, but I've a feeling that she will not find it and rather all those creatures will keep attacking and fucking her. Verify the controls at the Start. There's 20 enemy types, 4 stages bonus 1 (available once you clear that the 4th phase).
The underground tentacle monster which wants to find girls pregnant from their egg attacked Young couple. Military and researchers knows about this and they've been working hard to prevent this.