Crypt of the NecroDancer is the most unique and replayable rogue-like I've ever played. For years, people have been mixing rogue-like with many different genres. 2D platformers, Real-time strategy, dungeon-crawling, there's been all kinds of hybrids. But this mixture really blows the rest away. A rogue-like, with rhythm? At first, it might sound rediculous. It might sound like it would never work. But, Brace Yourself Games made it work. And boy, did they make it work. Think of Crypt as a Mystery Dungeon game. A turn-based over the head dungeon crawler. That is basically what it is. The turns are every beat in the music, and both you and the enemies move each beat. The soundtrack was specifically made to have an easy to keep beat, and the visuals at the bottom of the screen guide you as well. If you still have a hard time keeping the beat, there is a character unlocked from the beginning that isn't affected by the rhythm. Everything just moves when you do, and you can experience everything the game has to offer just with that character. So, really, if you're a fan of the rogue-like genre, there is no reason not to give this game a try.
+ Nicely done pixel art, characters are colorful and easy to identify
+ Tons of unique items and enemies that keep every run fresh
+ Rhythm is a simple and fun mechanic, not an annoying gimmick
+ Special character unlocked from the start for those who can't keep a beat
+++ An amazing soundtrack by Danny Baranowsky, composer for Super Meat Boy and the original Binding of Isaac
+/- Simple, four button controls. Activating items usually means pressing two buttons at once, which can be a bit weird sometimes. These controls can be changed in the options, however.
- Bit of a high learning curve. Playing individual zones with upgrades is far easier than playing through the entire game starting with only two hearts and a dagger.
- Still in early access. You'll probably find some minor bugs, (nothing gamebreaking) some items/characters are still being added, and the final level is yet to be released.
Overall, I'd say buy it. If the early access part really bothers you that much, then just wait. It'll be done in the next few months.