Hello everyone! As the title says, I took the liberty of preparing a new custom icon for the game (which is basically the rumble arena 2 logo), and you can see it here:

Feel free to use as you see fit!

PS: If you're wondering where would this "Game Icon" appear, you can see it in your profile settings in your followed games list, to the left of the game's title. You can see a preview of how it'd look on this photo here.