If your game is something related to playing as a block, try changing the design up a bit the thumbnail and icon look similar and the only changes that’s been made is moving objects at different corners and degrees. It’s slightly here and there to understand what is actual going on in icon or what information is included, to give players a view why should I play this.
Considering that the game’s name is called “The Block Awaits” add something unique that gives players a little information about what the game is about.
Showcasing certain items that are part of the actual game is good it’ll give information on what players will be seeing in the thumbnail as for why should I click on this. You also want to have something interesting and not showcasing just a simplistic block however that depends on what the game is really about?