I really liked this game, but its got a few problems that need to be sorted to make it really solid:
The good:
-awesome concept: this is a sort of "reverse" tower defense game.
-devices: the fact that you can combine them for effects is awesome. You also have a really solid set of tools for saving the humans
-humor: splat sounds when your humans die. A satisfying demise.
Areas for improvement:
- Device issues: The device for making the humans converge on a spot works "too" well- I can't get them to go to the next spot unless they overlap in exactly the right place. I can't tell how far the range for this tool is until I've already set it down. Often I'll know the correct strategy for a map but be unable to execute it.
-ambiguous: The tutorial is optional, but there's no way to figure out what's happening without it.
-motivation: too many objects are given to you in the getgo. It would be more fun to unlock them and become more powerful while you face heavier challenges.
-ambiance: the atmosphere is actually pretty good, but it could be filled in a little more, perhaps with a story line and some quirky this-n-thats.
That's my 2 cents- hope it helps.