Phenomenal. This game doesn't just lay out those inspirations for nothing. It feels straight out like a build engine game, but extra. The level itself is short but it shows a lot of potential, a lot for bigger maps with even more interiors, caves, maybe ports, boats. 

My only criticisms, if any, is that the shotgun might be too good. The areas felt a bit cramped and the foliage was too high and it got in a way of things. Also the grappling had a significant delay which was slightly annoying. Otherwise, the speed, feel and everything else. Perfect.