Howdy! I certainly can make what you're asking for!

I don't see any particular difficult elements when it comes to neither the background or the enemies.
While my "portfolio" might be a bit outdate, some stuff are still relevant: https://imgur.com/a/xAUHE
But i kinda thought that something newer would be in order to be shown, so i just kinda made four enemies within the restrictions you posted. 

Not sure if the attachement is working correctly so i'll just put a backup link here: https://imgur.com/a/vkTBAs8
We can discuss my rates privately, You can contact me on: martinmullvad@gmail.com