After playing for 3 hours, I have come across some valuable information. If anyone wants to mess around with any of the below information to see if It leads anywhere, please do and make sure to post back on this topic!

Here is the info:

In the lighthouse, there is 4 knobs...one on each level of the lighthouse. Each knob can be turned between the numbers 0-9. The higher the number, the higher the pitch that comes from it. Once you turn one knob, the other knobs move. How much they move is yet to be discovered. They might possibly move in different increments depending on which one you hit. The colors are as followed: Purple knob on bottom level, Blue on 2nd level, Orange on 3rd Level, and the upper level is a yellow knob. I would imagine the colors have something to do with it.

Second bit of info, there are 4 small round objects in the ground around the light house. When you hold X on them, they make a different pitch. Im guessing, you have to make a sort of song out of it?

Third bit of information. When you go down the slide in the lighthouse, it makes a noise that sounds like....well, sliding. The weird part is that it continues to make that noise after you have gotten off the slide. Eventually, the noise will go away. I want to say you have to do the easter egg before the sound goes out? But for all I know, it could simply be a glitch.

That is all the info I have for now. Feel free to post new information or continuing information about the information above.