We're really trying our absolute best but unfortunately we've had some unexpected and upsetting compatibility issues. AMD OpenGL is riddled with problems, some of which made the game unplayable. I just last night found a workaround to fix the last of the serious ones but I still need to fully implement the solution. I've wasted a lot of time with unsuccessfully trying to find some way to stop these problems from surfacing. We have over twelve hundred alpha backers, more than 40% need to be able run it! We had a go at getting it working on Intel graphics, it's doubtful they have the performance to run the game but it's worth a try. So far we've only managed to produce a blank screen on those and even that was a challenge.
We've fallen behind schedule because of these problems but bar any more unexpected issues it should all be ready in just a few days, tomorrow is unfortunately not possible at this point.
Such is the nature of software development. You can't predict the presence of bugs/issues, nor predict how long they will set you back. And ensuring platform independence can be a real pain, full of unexpected issues.
When estimating how long a task will take me, I always multiply by pi - that seems to give a more realistic time estimate in practice!
I certainly understand the delay, and appreciate the time and effort that you're putting into getting the game out to us! I'd much rather you got it working properly before sending it to us, instead of sending us something rushed that won't work!
And thanks for the update - being well-informed makes a huge difference, no matter whether the news is good or bad