What is it actually? It's an anthology of little RPGs, each one inspired by a song. Hence the whole mixtape thing. And when I say little, I mean it. Most of them are only a couple of pages long.
As someone who loves looking at quirky, little RPGs, this could have been called the Indie Treasure Trove Megamix :D
Don't get me wrong. If you really want to find RPGs that are only a couple pages long and have a very tight focus, they aren't that hard to find. And there are some gems out there. Lover of Jet and Gold comes to mind as one I want to really try out sometime.
However, with the Indie Mixtape Megamix, I didn't just get a whole bunch of them in one place. I got more than thirty games that have been vetted and quite probably edited. No offense to the brave souls who put their heartfelt designs on the Internet for me to find but I've read some pretty bad games. The quality of the Indie Mixtape Megamix is above average.
At the same time, none of these games are for everyone and none of them are going to replace Dungeons and Dragons or Call of Cthulhu as a go to game to play all the time. These are tightly focused games that are designed to tell specific stories, games you might only play once.
And, being so short, they do require some improvising and house rules when it comes to some of the details. Having some idea how Indie games work is definitely helpful.
Still, even if it isn't the ultimate RPG experience, it's pretty neat.
I am in no hurry to rush through the collection. I'm planning on slowly reading it, looking at every game as its own special snowflake. It'll be fun.