Not bad!
But I suggest you remove the "again"-button if it doesn't work. Also, I noticed you played an audio clip once, then used some other music, and then used the first clip again. Try to vary your music, it makes it sound better. Also, voices are always a plus, but aren't necessary.
The faces were done well, the blood was somewhat unrealistic, but I'm sure you'll learn. Also, try to make them walk more realistic. The guy just slides over the screen without him moving.
Good work anyway, nice storyline to it, I look forward to the next one.