great game
I agree with Pocru on some aspects, but I think that the game wasn't merely the use of two blocks. Every 2-5 levels, i found that I had to slightly alter my strategy because of getting a new block, or facing a new enemy. I agree that you could have come up with more variety in the enemies, though the block varieties were fine. I liked the graphics, music, and sprites in it, though if I had to change something, I would add more music. Maybe have it at a different music track for each 'sin'? You could have also included more upgrades, and ways to obtain gold souls.
All in all, it was a great game, and I would not be surprised to see it on the front page sooner or later. Keep up the good work!