v1.5.2 - Pause screen, fixes

Hi!

This is a small update that aims to fix a problem where the player could stand on certain spots that the spiders couldn't reach, essentially making them invincible. To achieve this, the following things were done:

• The spiders can now walk behind props (such as the car, bed, etc.), and when doing so they will have a dither effect so you can still see them
• The size of the spider's damage hitbox has been increased
• The spiders now track the foot of the player rather than the center when navigating

A pause screen has also been added, that appears when pressing Esc or P, allowing you to quit the game during a match (losing the score).