Very fun.
Firstly, alot of people say they can't get past level 4, I did have some problems with this, however after about a minute the final enemy came, so It's nothing TOO dramatic, but obviously still needs fixing.
Now my review, overall the game was very entertaining, kept me busy most of the morning, the graphics were adaquate, nothing to fantastic, but alot better then most other games.
I also liked the Elemental weapons, however I failed to see how they differd, does the fire hammer do any more damage than the ice hammer? Or affect certain enemies differently?
Would be something to consider.
Also, after purchasing the fire hammer, I could simply stand at the far left hand side and keep clicking the mouse, which would - more often then not - create a continues wave of the special attack.
Very few enemies actually made It onto the screen after learning that, maybe make It so the special can only be activated If you actually hit an enemy, and not just random chance on mouse click.
Finally! when trying to hit someone on the edges of the screen I ended up moving further away from them instead of actually hitting them, due to the auto scroll, I don't see how this can be fixed, but I thought It was worth a mention since It really annoyed me at first -_-
Nevertheless a very good game, and good luck with your future projects!