This game is unplayable. Towers disappear half the time you try to move them, and you have to click on the awkward space between the two buttons to even attempt that. No upgrades, no clear progression, it's just a fight to see how many towers you can place.
Enjoyable. Just a few suggestions.
1. Speed up button (x2,x3)
2. Changeable quality (Low,medium,high)
3. Hotkeys (1-6 or something for spells) and to start the next wave.
 "Water Tower's Defence!"){kind=icon}
 "Monster Bastion"){kind=icon}
 "Post it Draw it"){kind=icon}
towers fixed, please see response below