Hi Ned! I am currently using a custom compiled version based on 2.1.1 and have replaced the icon as part of the build. However, I think there should be an "Icon" option in the application project settings.
<span <thank="" you="" very="" much,="" i="" could="" change="" it;="" lang="en">Thank you very much, I could change it;By the way your game is very cool, the voxel graphics are very nice.</span>