I had a blast playing this even if I was really bad at it. The switching between moving and shooting was really effective as a way of constantly making you think 2-3 moves ahead. Only feedback I have as far as improvement goes is maybe making the "timer" on the bottom of the screen larger and near the middle of the screen so it's really noticeable? Once I finally saw it, I was able to actually plan my movement patterns and that made the game work really well.
Nice job!