Absolutely love the simple concept of wackamole game :D
Very well programed and extremely smooth and polished.

I would suggest perhaps for the full release the addition of bonus stages with their own special tasks (like hitting only some specific objects or mash fastest as you can to break something)

and of course some power ups would be fun for extra score 
- It would be cool perhaps to have mode where you collect the letters "MEGA" so when you get them all you can enter "MEGA MAGA MODE" where your score multiplier is 5x and all you need is to hold down the mouse button to unleash a flurry of strikes for a while.