Wolfire Games' Receiveris a first-person shooter unlike any other I've played.
Instead of a quick button press to reload your gun, here, reloading is a much more realistic, multi-step process that requires effort on your part. As in, you'll need to actually practice. Also, levels are randomized and there are creepy drones out to get you. Good luck!
You can and should experience Receiver, if only for a few moments, especially now that it's free through the Humble Store. Offer's good for today only. Be sure to redeem your Steam key by September 29.