DIMENSIONAL SLAUGHTER ver. SIGMA 2.5

These update notes actually cover the last few small updates I have made, since I didn't give them all their own individual update notes.
- Fixed a bug where the player gains invincibly from outside damage upon being teleported back to the arena as a result of venturing too far, whilst having recently taken damage.
- Made certain areas of the tutorial more obvious.
- Updates some menu elements.
- Added an animation for when firing the sniper whilst in the middle of scoping.
- Balance changes.
- Added a screen for when you finish the demo.
- Probably lots of other stuff I forgot. Maybe I even introduced some new bugs, who knows ¯\_(ツ)_/¯