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When you first reach 1000 points, you can upgrade to 4 blobs. The backrounds: Twin Shooter: Green. Squarer: Red. Gray Blob: Yellow, and Turreter: Light Blue.
What the backrounds do:
Red: Debuff to Projectile Damage.
Green: Buff to Reload.
Light Blue: Debuff to health.
Blue: Buff to speed.
Yellow: Buff to health.