The premise of finding new spells on each level works really well, and the multi-syllable spellcasting gave a unique tactical element.

That's actually a great game!
The spellcasting ability is a very nice mechanic, even though I don't think you can randomly press spells to discover them, right? I think it would have been cool if you find out a combination and activate a spell this way instead of finding it in a chest.

Apart from the spell scrolls I didn't find any other upgrades like armor or weapons. That would have been a great addition. Because in it's current form all I can really do is use magic to defeat enemies. And even though there are a bunch of mana potions, I still ran out of mana a lot.

I was also missing sound effects. I think they would have enhanced the experience a lot!

And a more minor thing is the combat log in the bottom left. If multiple things happen at the same time, like I am attacking someone and they are attacking me, I can't read both messages. Maybe just increase the number of lines shown.
But over all a great submission!

This is really good! I love the spell-casting mechanic, and the way spells are randomised each run. Looks great and is very smooth to play. The dungeon generation is also nice.

I think experimenting to find new spells could be made more exiting: mana is so precious, and on top of that you suffer mana-burn for getting it wrong! Maybe you could unlock partial information about spells when you fail…

(Fwiw, your Rust+WebAssembly engine is really smooth. I’d like to know more about it!)