Pretty good game.
I think the fast enemies are a bit too fast for the size of the screen you are dealing with, although the 'stun' feature is nice. The orcs too have far too much health- an almost boss amount- it's very very hard to try to kill them if you still have a basic weapon. Normally the best rule of thumb for games like this with three stats is to have a unit either great at 1 and okay at the other 2, or great at 2 and very bad at 1, so it always has a weakness- that makes the units into a "class" sort of system where you go "okay, I can use fireball for 2x damage against unit Y because ____."
Also, your rate of fire control can be overridden by simply spam clicking very quickly quite easily.