It did take a bit to understand the idea behind it, but it is a really interesting idea behind it. I understand AI was a last-time addition, though I feel like the blocking mechanic is only for it to use. I'd say I have a small issue with the presentation. Mostly about how the AI turns look like. I reckon some transition, or even change of the background colour, would work well there. The controls are functional, but feel a bit sluggish, though this isn't a timed game and aren't the worst problem. If it was up to me, I'd add a visual notification in which direction Q and E rotate the block.
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Perhaps worth considering the spells being asymmetrical between player and AI. AI might just have more more negative interactions (and easier to achieve), perhaps with a different winning condition. And perhaps the player's special spell could be selectable... With asymmetrical approach you wouldn't even need a robust AI as long as it would be good spells to make the game interesting for the player.