I think this game is best described as a diamond in the rough. The variety of interesting attacks you created are amazing!
I finished the entirety of the game and it really shines in the bullethell-esque moments where the screen is filled with attacks from top to bottom. I just would've wished that the movement was a bit less slugglish and that the maps were a bit clear in where you can and cannot go through.
I also missed incentive to switch dice all that much, which could've been interesting. Perhaps if they had different colours which contoured specific enemies that could've created interesting situations.
I also would've considered change the right mouse button to a dash, and putting the throwing distance of lmb a bit higher to rebalance it.
Overall it has lots of potential though, and I think this combat system could sustain hours of gameplay with just a tiny bit of extra tweaking.