Remove remains of Unarmed tag in DestroyByContact.cs
Only score Player's kills
Fix Enemy prefabs following Player
Make Enemy tilt in the right direction
Stop Enemies recoiling from own shots
Inc. Enemy chance to 0.3; reduce jerkiness with Interpolation
Improve Enemy GameObject

* Shoot to target detected with ProximityDetector
* Ignore own shots and other Enemy ships
* Increase delay after spawning an Enemy to prevent Asteroid crashes
* Refactor
Make Enemies shoot at Player
Check if lastShot is not null