Quoted from Sparky

Space Panic was a close clone...

Quoted Text

Space Panic is a 1980 arcade game designed by Universal. Chris Crawford calls it the first ever platform game;[1] as it pre-dates Nintendo's Donkey Kong (from 1981) which is often cited as the original platform game. It differs from most platform games (including Donkey Kong) in that the character cannot jump over obstacles. The main character digs holes in the platforms that he must lure the aliens into. He must then hit them to knock them out of the hole and off the screen. In later levels, two holes must be lined up vertically in order to dispose of the aliens. There is also a limited supply of oxygen.

While it may have indirectly influenced all subsequent platform games, it certainly directly influenced some very similar games at the time. These included some almost identical clones such as Acornsoft's Monsters (for the BBC Micro and Acorn Electron) and the Apple II's Apple Panic as well as the popular Lode Runner, which looked very similar and used the basic premise of digging holes to trap enemies. Universal revisited the genre again in 1983 with the release of Mr. Do's Castle which incorporated and expanded upon many of the play styles explored in this seminal game.

Quoted from Monkeybug

I was going to say Apple Panic...but after a consultation with Wikipedia...it was a rip off of Space Panic.

http://en.wikipedia.org/wiki/Space_Panic