I've had a long-standing rule to avoid getting involved in any sort of crowdfunded activities. I didn't donate to Shadowrun or Wasteland, but I did buy and enjoy both of them (I'm plugging both of those games right now, just so you know they're good). I haven't...
The Good: Classic platforming gameplay, decent story, lots of places to go, lots of different things to kill
The Bad: No sense of direction what-so-ever can make you lost easily, cheap deaths
I remember Tomba! back when I was a kid. That was a really great game then. It even is for today but of course shows it's flaws more now. The story of Tomba! is about pigs...evil pigs. You are a caveman looking dude with pink hair who naps under a tree one day and an evil pig comes and swipes your bracelet your grandfather gave you. You try to recover it but you wind up doing more than just that. While the game has great platforming abilities it's plagued with cheap deaths and not being able to find your way most of the time. With no map or any hints what-so-ever it can make things frustrating. While the game sports many different enemies and environments it makes you feel like some thing's missing anyway. The main draw to this game was the unique idea of 2D and 3D mixed platforming. There are two parts of each level but one is behind each other. You can jump down from 2D platforms and come out of it like you would in a 3D game. This was both trippy and unique at the time. Make sure you play this game is you haven't and you'll love it.