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The time-slow combined with the ability to hit bullets/enemies back provides both defensive and offensive strategies. The global slowtime allows quick escapes and attacks in a tight place. Killing enemies also reloads your timeslow and you can lose health to get more timeslow. Between waves you have the choice to heal, get a global slow or extra points.

Third-party resources
"Shooter Sprite Package" by "Posh Toffee Games" from Unity Asset Store

Contributors
Osama Abuzaid - programmer & game designer
Jon-Erik Klint - programmer & game designer & graphics