Add gradient to enemies
Improve enemy height randomization
Add score
Relocate cheats declaration
Add sound effect files
Add preloader file
Remove spaces from sound effect filenames
Add death sounds to game
Merge branch 'feature/sound_effects' into develop
Merge branch 'develop' into feature/styling
Use mp3 instead of wav files
Add new audio files
Add sound calls for different events
Add preload screen
Tweaked speed
Trim audio event listeners
Add highscore feature
Rename score file
Merge branch 'feature/styling' into develop
Reorder states