Not bad,
The game isn't bad, and the first in the series is a huge hit on my site (one of the top played games). This one however needed some upgrades, and some minor issues really hurt it.
Here's what you did wrong, and can still fix VERY easily. This is from one game developer to another, so understand it's just helpful advice.
First, you have keyboard controls, support WASD, it'll really add to your rankings, trust me.
Second, allow pressing space, or enter, to proceed to the next level. It's a horrible idea to force the player to switch between keyboard and mouse, especially for something as simple as just starting the next level. It's annoying, and although it doesn't seem so bad, you're losing score from various users who found that annoying and dropped a low vote.
Lastly, although the 3 second count down is nice, I would have sped it up a tiny bit, or gotten rid of it entirely. Allowing the player to just press a key when they're ready, the sluggish speeds due to waiting for that also annoy your players, again, it all adds up.
As you can see, the three above things hurt you in the end, especially if you find players annoyed by more than one of them, they'll likely drop you a low vote, rather than the 3 or higher this game deserves.
Overall, it's a nice addition to the first game, and it's not bad, you should just really consider cleaning up those minor issues, it shouldn't take you more than an hour to fix it up and re-submit this. As for the level editor, great addition, I know some don't like the idea of it only being on your site, but hey, you need to make some money too, nice move as far as I'm concerned. Let me know if you fix those things up, I promise you it'll help your ratings, as well as earnings in the end. Good work, keep it up.