Really... not good.
The acceleration on falling bodies is way too low, and the coefficient of restitution for the stick men hitting the ground is way too high! Falling to the ground adds energy to the interaction! That's insane!
The only slightly accurate physics being shown here is the reflection angle, and that bugs out sometimes, too.
Targeting reticle is really buggy, particularly near the walls.
It's super buggy in its current state, but even if the bugs were fixed, it's too generic to be interesting. When I see "using the games physics in creative ways," I've come to expect a lot more than a few falling puzzles and exploding barrels. A lot of the levels are blatant carbon copies of each other. There isn't enough here to be worth playing for more than a few minutes. Some levels are slightly innovative, and then the next level is a complete copy of a previous puzzle.
Your highest priority should be fixing the collisions, because playing with it in its current state is just infuriating.