v0.4.0 Changelogs

Changelogs v0.4.0

You can now shoot stuff, awesome right? 

General game updates:
- Implemented enemy system
- Implemented stage effect
- Implemented shooting (Press Z to shoot by default)
- Number of enemy killed will now be saved to profile
- Further increased the scaling speed for block spawn time
- Increased score per tick for normal and hard difficulty:
  Normal 500 => 1000
  Hard 1000 => 2500
  
Skin updates:
- Added SFX for shooting, enemy hit, enemy dead, and stage effect
- Added texture for laser

Bug fixes:
- Fixed a bug where profile deletion deletes incorrectly after creating a new profile