It's primarily a vehicle for
unlocking extras in Dead Space 2 when it ships — those extras being a hack suit with bonus perks, a weapon skin, bonus audio logs, and extra power nodes,
health packs, and credits within the game — but you also get a little extra back story setup for Dead Space 2 with a few mini games mixed in.
These power - ups range from simple
health packs and more power for your weapons to major bonuses which
unlock things like shock waves — which emit and explosion in all directions — and limit attacks which massively damage every enemy on - screen in a dazzling explosion of epic destruction, these are pretty awesome.