Please note that Umbra: Shadow of Death has a demo that can be found on the main page of the game (or here: Demo Link).

Of course, the demo doesn't have truck/crane driving and a machine gun, but not all demos do...!

Umbra was designed to have a very different style of game-play to those well known and great games of this genre that served as its inspiration. Some of the puzzles are very challenging, and you may spend a lot of time trying to figure them out.... If you're intrigued but unsure about how the game will play, please check out the demo for your own peace of mind.