I have a soft spot for a well executed genre mashup, and Crypt of the NecroDancer hits the bullseye of that sweet spot.
It's a smart, slick roguelike where a run takes little more than 10 minutes to play, but is engaging from the start. The inclusion of a rhythm-action mechanic, where you're rewarded for moving on the beat of the music is both novel and fun. It adds a sense of urgency (and sometimes panic), while also opening up a risk/reward mechanic of when it's smart to *not* move, lose your multiplier, but gain a tactical advantage in your approach to a given enemy.
The enemy and powerup design is varied and interesting, allowing each run to play out very differently. There's a very strong feeling of ongoing progressive mastery that happens, as you figure out the right way to defeat new monster types and the best way to utilize the items you pick up.
Of particular note is that you can brush the dust off your old DDR dance pad, and use that to play the game. Any game that allows you use old ludicrous peripherals scores bonus points in my book. Now, who wants to play a couple of rounds of Streetfighter with a Dreamcast fishing rod controller? FIGHT!
Note - while it's still notionally in Early Access at the time that this review is written, it very much feels like a finished game with free content coming down the pike.