I'm a big fan of tower defense (and clams for the duration of this game jam). Also, the audio is soooooo sooooo good.
One thing I thought detracted from the experience was definitely the AI of the turrets. It seemed somewhat random what they targeted, but I would really hope they targeted what is closest to the Clam.
I liked the progression in the beginning! If there's future development I'd love to see what direction this takes.