http://www.freewebtown.com/wpoeit/bsplanet.html
You can get to know the game at this site above and at the bottom of
the page you'll find the download for it. Think of it as Blake Stone 2
which is what it really is. Like Blake Stone 1: Aliens of Gold being a
mere clone of Wolfenstein 3D given the similar infrastructure,
unfortunately, Blake Stone 2: Planet Strike is likewise a clone of
Wolfenstein's second game Spear of Destiny (prequel on a historian's
note). It was hilarious to find Blake Stone's hand movement resembling
that of Doom's. Still if you liked the first Blake Stone, give this one
a shot and try it for what it's worth now that you won't have a penny
to lose.