Digital version of an incredibly addicting tabletop game with tons of replay value. The UI is smooth and easy to use, and all the cards are very readable at different resolutions. The ability to active/use cards without having to double-click each one is very handy once you get used to the game and learn the cards by heart - which will happen if you use a hero long enough. The music is great as well, which was a pleasant surprise, and fits the superhero theme wonderfully. The inclusion of unlockable variant promo cards is a great addition, because each varant changes up the base power of the hero, or in the villain's case can really change the way the villain plays. This adds even more variety and combinations to a game already full of hundreds of hero/villain/environment combinations. And with the expansions inevitably on their way, there'll be even more. The tutorial is also really well done so you don't have to worry about being familiar with the tabletop rules before hand. It really walked through everything you could possibly need to know about how the game works, which is nice for those who've never played before.
On the flipside, the only thing I don't really like about this digital version is the lack of online multiplayer, although it is coming in a future update. The game does, however, lend itself really well to playing multiplayer locally by simply sharing the computer. And of course being able to play the game solo when you're craving a Sentinels fix is really where this game shines. Controller support would also be nice for playing on a TV, but that is also coming down the pipe eventually. Handleabra games is really doing a nice job of making the transition from physical boardgame to digital version.
As for the gameplay itself, it plays exactly like the tabletop version. Each player takes control of a superhero and teams up to take down a villain. Each hero has it's own unique deck of cards with wildly varying playstyles between each hero. Legacy, for example, is the paragon of justice who uses his cards and abilities to buff and defend his team of heroes, while someone like Tachyon uses her super-speed to burn through her deck drawing and discarding cards, many of which do more damage based on how many specific cards are in her discard pile. Each hero's deck of cards fits the hero's theme and superpower wonderfully, making for a different experience and strategy with each hero.
However, the villains also have a deck of cards full of minions and nasty super-powered attacks to take down the heroes. At some point during the game the villain's card will trigger an effect that causes it to flip over, which changes up the mechanics of how the villain plays - and sometimes changes the max HP the villain has. Plus each villain has a nemesis (or multiple ones) attached to it, which means the villain does extra damage to his nemesis, and vice-versa. And you can't forget about the environment you're playing on. After the villain has had his turn and all the heroes have gone, the environment itself gets a turn and draws a card from it's deck. Sometimes the environment deck helps the heroes out in someway, most of the time it does horrible, horrible things to the players like having pterodactyls steal all of your equipment. Each enviroment has it's own gimmicks to it's deck. Megalopolis has lots of city hazards like a speeding train that can damage both heroes and villains, or cops that show up to aid the heroes. Meanwhile something like Wagner Mars Base has a self-destruct timer, which if it reaches the end kills both the heroes and the villain and everyone on the Mars base ending in a draw.
The game has hundreds of combinations, as each time you play you pick a villain, and environment, and anywhere between 3-5 heroes. Everytime you play even just changing one of those from the previous game can really affect the outcome of the game and change the strategy you'll be using. The game has so much variety, and the rules are so simple to pick it up, that it makes itself very addicting. You can play dozens of times and still be surprised when something crazy happens that flips the current game on it's head. I really can't recommend this enough.