Not bad.
I've seen a lot of these on Newgrounds lately or at least a lot of them have been coming in through the review request club. I saw a couple of errors every now and then where it looked like one of the black boxes were out of place or it looked like something wasn't lined up the right way. Those could have been cleaned up a little bit to make it better. Also, the length of the submission is what really got me I guess. It should have been much longer and you should have drawn out different patterns with the blocks. Any pictures that you could have made would have probably been a great thing to do. At the end, THE END didn't really show up as great as it should have been. Perhaps the use of smaller squares would have given you enough room to space it out properly. Maybe you could have added a couple of other backgrounds and colors, without overdoing it and making it one of those flashing color/light submissions, which will put someone into a seizure. Anyway, probably deserves around a 6 or a 7, but since I just gave you an 8 on two spam submissions, which I found humorous, I will instead give you a 9 for effort. You should come back and try this again sometime.