Hey!
The route with the key spell is certainly harder (it is possible to still make it but I think the hardest route of all). I had a few miscasts, hitting c when I wanted to hit space :'D That's the reason I made it possible to chose no spell to prevent accidental casts, but hitting F instead of C didn't happen to me - do you think the keys should be further away or just a learn thing if it happened only once or twice?
And it is supposed to be a puzzle game :)
Thanks for playing the game!