I absolutely love the music for this!
Took me a minute to get my head around gameplay, but once I did I really got into it, was a really satisfying challenge. The central conceit of changing and/or disabling rules is fantastic, and is a perfect use of the limitation. I found I really enjoyed setting myself strict challenges (only change one rule on this level, don't change a specific rule for this one) - was a whole lot of fun :)
I found it a little tricky to tell which tiles were the patterned ones, but I got used to it pretty quickly so it wasn't a big deal. Besides that had a great time with this