Originally Posted by holeraw
What such an upgrade did he promise?
Maybe you are expecting a bit too much? I mean you can practically buy this game for $15, that might be a special price reserved for backers but I wouldn't expect that you'd be buying a lot more than what you paid for.

Not saying he did, saying it feels like he did. I'd really prefer he had stated more of what we can expect in the beginning.
That said, simple mod tools (not entire SDKs) for low budget games have been known to exist.