I'll be honest that when I first started the project (and continue to work on it) that I was conflicted. I truly love his work. I spent hours and my weekends analyzing his artwork. I'm still studying his usage of colors because there's still work to be done there.
With the discovery of legal threats and actions against Scott Blake I was disheartened because I don't believe he would like me working on this project. Here's an artist I admire and here I am doing something I love that he may not like. Difficult to come to terms with. Like everyone on HackerNews we're driven to create and solve problems. Curiosity and challenge got the best of me and I pushed forward.
I still plan on releasing a Windows version and eventually making the source code public once I cleanup some things. I'm not making a killing on the app either. It's been out for a month and it's averaging me a dollar a day (with initial publicizing it on /r/macapps and other subreddits). Helps fuel the coffee that goes into these after hours side projects.
Since I'm charging for the app, I plan on donating a portion of the proceeds to the MoMA as well (after all, they're the source of inspiration and I hope this helps give back to other artists).