Tips
Ssaved the power ups for emergencies for when you're just about to lose your gems.
The blue-and-red units are incredibly useful during the early game - place as many as you can afford before moving onto single-coloured units.
You'll also need them for the 'My Favourite Flavor' (sic) Achievement, which requires you to complete a level using only one type of tower.

Embark on an inspiring mission of human connection beyond the UCA. Sam — with companions by his side — sets out on a new journey to save humanity from extinction. Join them as they traverse a world beset by otherworldly enemies, obstacles and a haunting question: should we have connected?