This is only a problem when running in Wine as Linux thinks those are different directories. So the levels with files in Levels\ don't work as the game is using levels\. Moving the files in Levels to levels makes them work. This with the build 1913 release.
Thank you for reporting. However, somebody already let me know. The alpha builds already come with everything in \levels\, and the next full version will also come without anything in \Levels\
This is only a problem when running in Wine as Linux thinks those are different directories. So the levels with files in Levels\ don't work as the game is using levels\. Moving the files in Levels to levels makes them work. This with the build 1913 release.
Other than that it runs perfectly in Wine.