Man am I tired of clicking!
I guess the violent abuse of my mouse in real life is mirrored in the game as the mouse wizard is assaulted by skeletons. I hope that was intentional.
As for a review, I lost the game 5 times before figuring out how to play. When I clicked on a skill I wanted to level up, I saw the number go down so I kept clicking and saw skeletons dying so I though that was how you played. Click to level up a skill and the combat is automated.
After dying, I played again watching the lower mouse make progress and again the top mouse failed to protect me.
I finally figured out to click on the skeletons because they were the only option left. I did signle click on them first thing but the combination of their loss of health only being shown as a slight color change, lack of any other feedback (a sound effect would be great here), and the fact that some of them lost health without being clicked on made me think it wasn't doing anything.
Otherwise, a quite new way to approach a tower defense game.