1/5 for posting this same thing every week. Seriously, if you would post multiple games in one week I could at least think you're too incompetent to know how to upgrade a game, but aren't doing it for the ad revenue. But if you wait an entire week every time, it's hard to think otherwise.
4/5 kinda hard to tell what is going on sometimes because of the graphic. Maybe if you had a hard black outline of all the enemies so I could tell them apart from terrain and dead enemies, that would make it easier.
@zephyrre: after a while more squares start to spawn. I've only ever gotten one extra one, though, and I was at over 9000 (no, seriously) points both times, so that takes a few minutes. I don't know if any more will spawn after that.