Single player card game where you dig through two 54 card decks on a time limit to defeat the very uniquely named big bad, "Darkness". Most card games have enough randomization because of the shuffling of cards, luck of the draw, and so forth, but for some reason Chainsaw Warrior feels the need to add die rolls to almost every action, including stats during character creation. On Hard difficulty the game can be over before its even begun because of bad die rolls for stats or bad card draws for equipment (because you're only allowed to chose catagory, not specific items). [Quick anecdote: Mark Rosewater at WotC noted that the main reason the Star Wars CCG failed was because fans hated having to roll dice for everything in a card game.]
Even if you perfectly pick your loadout and get decent stats, many cards in the play decks have incredibly gamebreaking abilities. For example, one card makes you reshuffle all the cards in the deck and start over, another will break your sole win condition weapon, and another will make you lose several turns (randomly decided how many, of course). The most frustrating part is these cards might as well say "You Lose!"... but they just tease you into playing an unwinnable game. Many cards also have stat debuffs (zombie venom or radiation) that stack over time and are difficult to remove, providing yet another way for you to lose the game.
Of course, being a cheap, direct iOS port also brings a slew of other issues. A touch screen interface with gigantic oversized buttons, "click-click-click to play" gameplay, and worst of all, savescumming. The decks are shuffled at the start of the game and are never reshuffled unless you trigger a certain trap. While this is realistic, it makes for bad video game gameplay. To put it simply, you can save the game every card and reload if you make a huge mistake or if you want to redo a fight (even the end boss!). This removed all of the challenge and distilled the game down into simple die rolls and restarts. While it is ignorable, you will still probably restart the game when you pull one of the previously mentioned "almost game-ending" cards.
Chainsaw Warrior was probably a lot more fun to play sitting on the couch on a weekend afternoon but is a huge headache in its poorly ported video game form. Only recommended for nostalgic value or for owners of the original game.