Quite interesting game, definitely gives retro (and flash game) vibes. Having lots of spells is nice if you know what's available to you and you can switch between them easily. Now, I had no idea what kind of spells I have and the charging time was kind of slow. The charge could work but perhaps it should be faster. Perhaps you could've had split the spells in three and have three buttons to charge, making them more available altogether.
I also feel there was text overload on screen. At least the combat log could have been hidable, or omitted completely since you still see the damage numbers flying.
Well done!