Got it at first run, the only big challange is the king slime, tracking when to switch colors and stuff. A pause function would be cool, but nice work!
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Happy you like it! (I made the graphics) It is quite easy to win, but not trivial. The real fun it trying to get a perfect score ;)
I think the fun is switching the tower colors in real time, so I don't think a pause function would be good (you can always press the help button, it puts the game in pause)