What a blast!
Well, I'll tell you what: I had a great time playing this game, although there are two things I'd change. First, you might want to include a couple more background options, maybe a couple that have texture but don't animate; I was getting a bit seasick by puzzle 39 (and the blank background was too boring). And second, maybe a hint feature would be helpful, too; some puzzles were rather easy, but a few were so hard I spent literally twenty minutes on each of them.
The music was great, the concept was simple, and the general execution was great. I look forward to a Crossblock 2!