
In terms of game play, D.A.R.K. is truly unique. When you're not mowing down wave after wave of zombies, the shooting controls go away and some platforming elements come into pay. Whether it be finding your way around flaming pipes, avoiding sentry-bots, or dodging laser traps, these moments provide a break from the relentless hordes of cleaning-spiderbots and zombies. Another interesting element of the game is the "wave" system. When you are fighting enemies, you can see how many waves there will be and what wave you are currently on. The enemies will keep spawning during each wave and become increasingly difficult to kill. Also at the end of some of the rounds a boss will appear that has a health bar of its own and is much harder to kill than the other enemies. As you progress through the game you will face three mega-bosses. These take a little more effort to kill than the other bosses and are not part of any wave.
Due to the short campaign, it will take several playthroughs to level up high enough to notice any difference with the upgrades. As of now D.A.R.K. is a fun, yet short lived shooter that provides you with as much adventure as you paid for. At a price of $2.99 I would say pick it up and try it for yourself if you love dual-stick shooters and Dead Space. If you are on the fence, I would wait until the update comes out and see how much it improves.