Basically a princess has been cursed by an evil wizard into a monster who is forced to dance forever. Click or tap off the designated parts to destroy the monster and save the princess! To round it up, it's quite a weird game. Originally made for the Commodore 64.
Thanks to @IlikeToast6 for the dance music. It's 'Green Hill Zone' from Sonic. Couldn't source the real music without SFX in the background :( Gameplay video here: https://www.youtube.com/watch?v=eSl1Io_y6uw