I remembered the event too late! I started bringing my idea to life hours ago, so I won't be able to submit the game, but, enjoy a video of the idea. The idea is as follows: You need to defend your area from bombs that enemy planes drop, however, the bombs are guided by the rhythm of the playing music, and the peak where the bomb synchronizes with the note played is where it's targeting, meaning the player would need to summon an energetic shield or something like that (I haven't decided yet) to stop the bomb's effect.

https://www.youtube.com/watch?v=1icIFM0EmLo