I really enjoyed watching this game come together during the development process. The hexagonal towers and inventive mechanics seem really compelling. While I get that you're aiming for a high skill ceiling, I wonder if perhaps you haven't also ended up with a rather intimidating skill floor as well? I'm not sure what to suggest, but it is quite difficult to do anything other than randomly stab at spells hoping that one of them won't drive you mad! Which is a mood in itself, of course :D
I'm not sure what to suggest. I think for me the most frustrating part was not being able to clearly see which spell I was selecting. If, for example, you could definitively scroll to and pick one, i.e. control the spin animation to some extent, that would help. So would a little bit of indication as to what was going on, that these spells were being procedurally generated or that they would be new each time. I really wanted to progress and see the impressive terrain you've been working on, but I couldn't get far enough through the game. Then again, I kind of suck at games so it could just be me!
I think there are some great concepts here, just need a tiny nod to playability to come alive. Technically impressive and I can't wait to see what you turn it into.