not bad -
It's a good idea, but not executed so well. It feels like more of an interactive clicking game than an actual shooter - it's nearly impossible to die and you have to wait for the enemies to get into position before you can actually kill them (which is due to filming really - you couldn't make a death animation for every single position they're in). I appreciate the limits of camera but lego is a versatile material, you could've made the death animations and other scenes a bit more impressive.
Overall though, it's a very good idea and it's pulled off pretty well.