We offered to help because we care about what you do tirelessly create, and enjoy the company of the like minded people that contribute to this forum.
I can understand issues with source. Maybe if you allowed several of us to proofread code, for syntax errors, variable and function/method spelling...a function at a time dispersed between individuals... that would leave logic to you. Cause i know hours at a computer and eventually all things run together. This would also allow us to contribute not in just extending the lifetime of a now possibly insecure and dated software, but make it our own because we participated, at least in what may seem like mundane tasks to you, but those of us attempting to learn what you've been doing for years, would be an experience and additional ways to apply what we are learning.
Have people sign confidentiality agreements if you're that worried about it. Besides the legal of it... you take this on yourselves, and we can appreciate that. What you miss is we offer to help, assist in any means possible... because we belive in what you're doing. Plainly, that is volunteers for free work... as we do here... because we believe in this, all of it.
For to long i was a slave to windows and the companies ethic of profits before people. It's very difficult to find the reverse anymore. There are people who want to be dedicated, but expect the same dedication not just in the product, but the communication, service, everything you say you offer. You've stated it in the site as well as here. The next one is important, but don't lose track of the communication and service you so readily state but sparsely supply. Having an alpha to test is not a reward or compensation for delay in communication. I'd rather here that you're having issues, that you need help... that's human... that's humane. And don't be afraid to accept help... we all need it, constantly.
I don't know if this will sway me, especially since i preferred lite to core. But as people, you have an opportunity to save what you started or destroy it. Hire some developers with similar ideals... you may even find them here. Not just developers either, maybe someone that can communicate your difficulties for you... you may even find a volunteer or two here. I've seen a few offer to deal with your public relations. Again, this all goes to what you're willing to do to continue what you created.
Thank you for the opportunity with the alpha. I'd rather hear from you though, as a person talking to a person, not a dev/ceo talking to a customer. Unscripted and real truth. If not for people, what your idea is supposedly about, then your software and idea means squat. Real story.