You put both Rust and Nim at 'Medium complexity to learn' but given that by default Rust has the 'borrow/lifetime checker' and that Nim has the GC, I'd say that

You put both Rust and Nim at 'Medium complexity to learn' but given that by default Rust has the 'borrow/lifetime checker' and that Nim has the GC, I'd say that Nim is easier to learn/use. Of course you pay the price in performance (GC latency), even if Nim's GC is described as 'soft real time' I doubt that it would work well for a >60fps game and now with VR if the framerate drop you can make the user dizzy..