Hahha... I love it!  Yup, was designed so that lasers would not seem useful but it was, indeed a trick! :)

Great job!

thats interesting, i've always done mine with rockets and a few blasters at the end and no more than 1 laser

If you want to add pictures to your post, I believe you can use the Insert/Edit image button (looks like a landscape) in this forum tool. If you're asking how to capture the Geodefense image in the first place, then you can use the iPhone/iPod Touch 4G built in screen capture tool. Once you're done with a level, press the Home and power button on the iPhone at the same time and it will capture the screen and save it as a picture to your Camera roll.

For Sneaky Snake I also used a combination of a few lasers and blasters, along with a missile tower near the big bend to soften up the creeps. I'm not 100% sure, but one of the tricks for this level seems to be that creeps come in the form of "mini-snakes" and that the lead creep for each mini-snake is much tougher than the others. So if you're able to kill the "head of the mini-snake" then rest of the "body" in that wave seem much easier to kill. So the trick is to wear down the head of the snake early if you can. Trying to do this while keeping the rest alive towards the end for more points is a tougher proposition though....