Alpha 1.9.1 a bunch of small fixes

    -Heavy boss can now use the ground slam attack (was previously disabled for testing purposes and I forgot to turn it back on)

    -Hitting a corpse no longer applies crazy knockback to it

    -Corpses no longer slow movement speed

    -Changed difficulty scaling (enemy spawn intervals) to an exponential decay instead of a flat decrease per level.

    -Changed enemy spawning so that it tries to surround the player instead of spawning more enemies from one direction

    -There is now a maximum number of enemies that spawn per checkpoint. It starts at 3, increasing by 1 per level.

    -The chance of enemies spawning with specialized fighting styles scales with checkpoints.