Gooped by Ogdred sports some very impressive goop usage (Goosage? ...no) in the early stages, from the visually impressive tidal wave of slime to the overarching threat of the buckling door. I also enjoyed the little touches throughout, such as the dissolving wooden crates.
In fact, if I were to review these entries on visuals and atmosphere alone, this entry would have absolutely smashed it. It's gorgeous!
Unfortunately, the use of goop as a threat, obstacle or even a visual element starts to fall away and the final parts of the map pack mostly revolve around turrets.
I want to emphasise that this was DAMN close to getting the top spot regardless, but the second half of the pack just wasn't goopy enough.
My blind playthrough can be seen here: