First off, congrats on making an excellent product. I think Spine is a awesome product and it has a ton of potential.
I am a fan and a fellow Seattleite in the 'industry', though I am not representing the company I work for in any way. I really want Spine to succeed and I think that you need to setup yourself todo so. Being a startup in Seattle is very expensive and that is going to work against you unless you are tapping into the talent pool and hiring. As you are now going down the path of a Technology company you should really consider your game plan and your team layout? If you were playing a Technology Startup video game would you hire a full-time artist when money is tight or would you hire another dev or event a part time community manager? Founders who really care about the company succeeding can still retain ownership and be invested in the company but not be on the payroll.
Finally, I would also revisit your 'Enterprise' licenses. Look how successful Adobe and other major companies are when they announced that companies with a certain profit margin have to pay more. Then look at products like GitHub, Sales force etc that do good Tier systems. You have very log price point to start, but as that price point goes up do does what you get out of it. I personally would hate to pay for the 'Enterprise' license unless there was some serious support?
Anyway, some food for thought or just my 2 cents.
Cheers,
Hays