Note: I played the initial version. There seems to be at least one post-submission update released now.
I don't think I've ever seen a tower defense game in Magical Girl Game Jam. It's cool to see a lot of different genres this time around!
Honestly, though, I couldn't help but be disappointed when I played the game. I was pretty hyped up by the backstory, description, and title, but the gameplay itself was a letdown.
There seems to be only one tower, and it's neither very effective nor satisfying to watch. It seems to only be able to attack enemies directly in front of it, with no ability to shoot past other towers and an extremely short range. Even then it only manages to get a shot off half the time, sometimes because it turns too slowly to track targets and sometimes for no apparent reason at all. It also does a terrible job of picking targets- even a simple "shoot at the thing that's farthest ahead and in range" logic would be better. On top of that, the animation is unsatisfying and the projectile is tiny and unimpressive.
Other than that it's very, very barebones. There's only one tower, as mentioned above, with no dialogue to preview and select other towers, no clicking on a tower to see available upgrades, no flavour text whatsoever, not even a count of remaining enemies. I think you mentioned you have a lot of updates planned, and in its current state it definitely has that feel of a game that was thrown together for a jam and submitted with a lot of features cut.
The graphics are solid enough, though some of them have too much of a mobile game feel for my tastes. The sound effects are just okay, but the music is well-chosen.
I feel almost like it should be considered a prototype than a finished game. I don't want to be too harsh, because it has potential, it has charm, heck even the backstory on the game page was a great little hook that got me excited for the game. But in its current state it's just not fun to play.
I think that needs to be the focus going forward: start by making the core gameplay fun. After that- and only after that- start expanding and filling in the missing pieces that make a fully featured tower defense game.