He-Man Tappers of Grayskull is a clicker set in the world of Eternia, where you fight against Skeletor and his helpers with the help of He-Man and the Masters of the Universe. And yes, these are indeed all the classic characters from the legendary animated series.
The controls in He-Man Tappers of Grayskull are practically identical to those of other games in this genre. Each time you touch the screen, He-Man swings his sword and does damage to whatever enemy is in front of him at that moment. Whenever an enemy dies, it releases coins you can use to improve He-Man's attributes, unlock new skills, or recruit friends to help.
As you destroy your enemies, including several different bosses, you can improve the skills of both He-Man and the Masters of the Universe pretty substantially. In total you can recruit up to 20 characters from the animated series to help you fight against Skeletor and his endless attacks.
He-Man Tappers of Grayskull is a game that may not offer anything too innovative, but obviously should appeal to any fan of the legendary animated series anyway. Basically, if you like the show you'll probably like the game for its great graphics and nostalgia factor. But if you don't know who He-Man is, you'd probably prefer playing a different clicker.