I like your idea, but I think you could do better on the execution. First of all, why is the icon and thumbnail basically the same picture? I would suggest having a completely different picture for each of them to give them more variety. I would also choose a different text, because the current one doesn’t really match the theme of the picture and I am finding “Sector 27” a bit blurry?
I see where you are going with the variety thing. Also, is it just me or have the icons begun showing up instead of thumbnails on the loading screen?
It’s an okay thumbnail, but definitely not the type that will make players join your game. It doesn’t show professionalism. The icon needs to convey what the game is about and look aesthetically pleasing. I think you did a good job by adding airplanes shooting each other, though. The composition for the thumbnail also doesn’t look good. I suggest having the airplanes little to the right so it naturally follows the eye, and changing the font of the title.