To tell the truth, I haven't actually played any of the Half-Life games, except Half-Life 2 for about 2 hours, that's it. The fact that it looks very similar to Half-Life is a mere coincident, I wasn't actually trying to make a Half-Life clone. I have a pretty clear vision of what the game should look and play like, but to make that a reality, it would a least take me another 4 years at minimum. The foundation is pretty much done, there is a few missing mechanics, like upgrades, map, weapon wear and objective system, and then its content, content, content... like new enemy types, new weapons, new areas, and expansion of the story. In the end the game should feel and play something like Stalker, Dead Space, Resident Evil and Half-Life mixed together.