Only recommended if you're a fan of the original game and want to see the it redone in a modern engine with more modern gameplay.
Impact isn't a bad game but there isn't a lot to truly recommend it. The gameplay is similar to the old Alien Breed with the addition of new weapons, enemies, and a 3d camera. Despite some of the enemies having ranged attacks or special abilities, the AI will charge you the majority of the time or amble about a short distance away not using their abilities. I'm not sure if this is any different on hard but that's how it is on normal. This also means the weapons, of which there is a decent variety, are ultimately just another way to dispatch the rushing bugs as nothing requires a change in tactics.
Similar to the original Dead Space, your character, the chief engineer, will shuffle fom waypoint to waypoint fixing everything that needs fixing and believe me a whole lot of ♥♥♥♥ is broken. This can get pretty tedious as the story is not advanced much in this first installment of the three episodes.
If you are planning on playing through all three episodes, be aware that your progress does not carry over from each game. Each episode is a separate executable and there is no way to import a save file to carry over your progress. This means at the start of episode 2, you have lost all your weapons, upgrades, and items acquired in episode 1. This feels very strange considering how quickly each episode picks up from the end of the last one.