I'm in the process of uploading the OST from Slap them All on YouTube. They didn't put any audio sliders into the game and there aren't any convenient audio files I could just open right away, so I had to extract them from the game's files, bless whoever made AssetStudio.
Stinkek
Download O2ABossLowHP3_EN.wav:
Stinkek
Download OBossAppears3_EN.wav:
Mr.Rubinshtein
Obelix being gay for 7 seconds
Stinkek
Download O2ABossAppears3_EN.wav:
Stinkek
it's 10 now
Stinkek
Apparently there are voice lines for co-op as well