Not bad. The zombies could use some ai, and the targets are a little small and fast to hit consistently, but it's okay for a first attempt.
I agree with SuperV on the physics demo. It's good to mess around with and see what it does, but I'd like to see someone do something a little more polished with it (Hey Attan - if you're reading this then get back to work on The Amazing Abdulah!)
The chicken shooter was my favorite, simply because of the different weapon types, and it seemed like you put more work into it. (I like the urine lazer )
Overall I have high hopes for you though, simply because you've managed to put up three game demos with only two forum posts. That can only mean one thing... you grasp Construct pretty well and are a quick learner. I look forward to seeing what you put out in the future.