Dreadzone game using your theme music

That was the theme music 7 Days originally used but it wasn't created by TFP. It was a store bought asset that any studio could purchase and use. Despite it being popular, TFP dropped the asset in favor of original music created in house.

The fact that another game is using it is exactly why TFP chose to go with something that would be uniquely theirs.

What's funny is that you claim that they are ripping off TFP while back in the day TFP was accused of ripping off 28 Days which this song sounds hauntingly familiar to.

Sorry if I came across accusatory. I should have used the term "using" as you did instead of using "ripping off" to keep everything on the same level. Peace.