Can someone please help me remember the name of this awesome rerto arcade game. It was on my PC about 10 years ago.

The game had two parts to each level. Firstly you would have to shoot down the aliens that were trying to land on your base. The ships would come down and you would have to shoot them with the cannons (one on each side of the screen). How many made it through depended on how many blobs then spawned on the three floors below. The blobs hang from the cieling and then after a while hatched. You had a gun and could go up and down the evevators on both sides of the screen and tried to kill them.

For the love of god please someone help me remember this game. It is actually killing me, trying to remember it. Please and thanks.
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