Never Give Up! is the last stage in Love is Sickness.
Strategy
At this level maximum number of enemies is 3, and they are mostly Red. Stacking Eraser (Wall) cat, Captain (Pirate) cat and Brah (Bean) cats is all you need to complete this level. The trick is to knockback enemy without killing them, slowly destroying enemy base and you won't have to deal with Bore and SLOTH.