The developers were forced to release too early due to contractual obligations with retailers. They've been hard at work improving it though, and they've already released eleven patches for the game.

The first release plan was Q1 2014 for release, so Q1 2015 was not too early, because they had one year more time!

Everyone who crowdfunds their game gets the expected release date wrong, usually by years. There's a reason why AAA developers like Nintendo don't give release dates until very late in development. It's incredibly hard to tell when your game is going to be finished, even if you have a lot of experience making games. If you're giving out an expected release date early on, it's basically a wild guess.