Fun game, very challenging. Some sounds or music would make it a little more interesting, but other than that, great job.

Interesting, difficult, could use some more panache. Sounds, animation, things like that. I liked it anyway

Fun, all it needs are some better graphics and sound effects, or perhaps even a small story.

Such as an alien loses the animals (humans) on it's farm, and the blind alien needs to use an echolocation system to recapture them in the crops field. That would give us a premise for why we are doing this, and the fact that we have to destroy crops in the process to find the hiding humans is an incentive to place down as few targets as possible, fearing we might compromise the farmer's seasonal yield.