Love the mechanic! Combining words into a variety of attacks is such a cool idea. It might be nice if orbs had some small amount of tracking--it got very frustrating to try to hit bosses with them while moving. And once you have a really good weapon built up, there isn't much incentive to do any more typing. If you want to go all-in on the typing mechanic, spamming weapons shouldn't be a viable mechanic...or at least should be limited somehow.
Didn't rate very high on use of theme, but five stars on fun! Great job!