Great entry! - The colour-changing mechanics work well, although as others have mentioned, you can die quite easily while trying to massage the colour wheel to what you need...
Have you thought about perhaps just starting off with an easier to use simple RGB or RBY tri-colour wheel, then later on it can be made gradually harder by adding the 'mixer' colours in between, possibly even 1 at a time, 'overlaying' the colour change areas? (obviously with say, a different graphic to show, and different angle values for each stage of progression?)
Great entry though! - loving the Zelda vibe/influence, and good tutorial!