This game is awesome, really polished and well made with good enemies and flow. I'm pretty sure i ran into one bug where the speed power up seemed to carry over between levels when you pick up the tower but honestly it's not even that much of a problem.
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There's an expected behavior that when you hold the tower, you are faster. I know that this souds weird, but as soon as we inverted the speed (with tower faster than without it), we noticed that there was a clever risk vs reward situation. But at that time, we'd already had the animation. In a future update, after the jam is over, we're going to change the animation to make it more obvious that you are faster with the turret. Thanks a lot for the feedback :D