Radical Heights did seem to be rushed a bit, most likely in an attempt to capitalise on some of the hype stirred up by current battle royale heavyweights PUBG and Fortnite. (altchar.com)
In current Battle Royale games the technology and the ideas weren't ever really about that, it was just sort of a simple extension to things that have existed before. (wccftech.com)
Survival was a mode that took what people love about current Battle Royal style games, added in roaming AI enemies to deal with, as well as status indicators that needed attention such as hunger, health, and temperature. (gamercrash.com)