LÖVE

Every time I try to make an .app file for osx distribution I run into the same problem with the game associating itself to .love-file, so that it starts instead of love.app when you try to run a love-file.
And yes I've followed the instructions on the wiki step by step!
What am I doing wrong?

Read the wiki again. You missed step 4: Modify SuperGame.app/Contents/Info.plist

Especially the part "and remove the section UTExportedTypeDeclarations which ensures that Mac OS does not associate all .love files with your app".