Sorry I answer this post but for some reason it wasn't and I only realized now that there was no comment. The purpose of this asset was not to have a background/tileset, it was more of a bonus.
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You can do it if you want. I didn't think the background was good, I was going to change it, but since it didn't give much financial return, the work I had to make the assets wasn't paid even close, so I didn't even bother to improve it to post and make other areas. I even made more enemy assets and tried to put them separately, but no good results, it was very frustrating.