What operating system are you running on? Have you tried different resolutions or running it with a lower graphics quality?
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OS X 10.11.4, MacBook Pro (Retina, 15-inch, Late 2013).
I thought I tried different resolutions and graphics qualities, but apparently not, because it seems to work when I change both. I'm playing the game in windowed mode, also. The game appears to not function at 1024x768 with fantastic graphics, but seems to work with 800x600 with simple graphics. At least I can play it now. Thanks! Maybe some of these details can lead to a patch if you're up for it.
Glad to hear you got it working! Sorry the resolution and graphics quality messed things up. I'm running my build on an OS X 10.11.3, MacBook Pro (13-inch, Mid-2012), so yours should definitely be strong enough to handle it.
I got a chance to walk around and I really like the concept. It definitely needs polish, but that's not unexpected. Great concept and it's pretty solid even as it is. Thanks!