Really creative and interesting idea! I managed to cast a couple of spells, I found the verbal components with the leaver the hardest, partly from working out which words applied, but mostly working out which levers corresponded to which words. I think if the levers themselves had the words and lights on them, or they were buttons, you could also then have the button itself light up, currently you have to parse the word, work out if it applies to the components, look at the colour, look at the levers and work out which one matches it and then click it, then check the colour of the square light under the word you were looking at, That's a lot of steps where something can go wrong for the player, not through them getting the wrong word, but getting mixed up elsewhere, which is not a great user experience. The verbal and somatic components inputs I thought were both fine and a nice level of difficulty. Found it quite fun to puzzle out the solution and run about to see the spell cast on the slow motion goblin!