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Credits:

1. Electric Exodus by FoxSynergy https://opengameart.org/content/electric-exodus

2. Featuring Music by Matthew Pablo 

http://www.matthewpablo.com/services 

https://opengameart.org/content/space-dimensions-8bitretro-version

3. Space Boss Battle Theme by Matthew Pablo

http://www.matthewpablo.com/services 

https://opengameart.org/content/space-boss-battle-theme

4. 8-Bit Retro SFX by MouthlessGames

https://opengameart.org/content/8-bit-retro-sfx