It's a good game. I like the concept, especially. I feel like with a bit more polish it would have some more potential and I also encountered a few annoying things.
1. Sometimes the tutorial text is off screen. I got to the part with mines, and the tutorial text for them was pretty much all off-screen. The people started exploding and I wasn't sure what to do. Eventually, on my third try, I found out I needed the wrench.
2. Sometimes the people get stuck on slopes. And I mean stuck stuck. There's no way to get them out. They just stay there, and get killed. Not even the run button works.
3. This is pretty minor, but the enemies moving through the ground makes the game a bit to hard.
Other than that, this is a great game with a good concept. Nice job! :)