First, Sometimes when you play a level the game will freeze for a few seconds when you upgrade your towers (even without many towers or enemies on screen). This lag will slowly increase as time goes on.
Second, when building multiple towers, they start to become invisible and the lag really increases especially the moment after you upgrade a tower.
Third, I have noticed sometime there will be a random tower in the very left corner of the screen. The tower is just barely visible.
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