Gameplay/Fun (5 stars) - an awesome little tower defense game. Very satisfying. Only complaint is that it was initially unclear that I had to buy "slots", or how to switch slots.
Graphics/Art (5 stars) - it's really quite beautiful
Audio (5 stars) - nice music and sound!
Theme (4 stars) - I suppose you're "enhancing" your tower, but that's true of pretty much every tower defense game.
Devlog (0 stars?) I couldn't get to the link