Here’s another game suggestion: “Alien Breed” (Team17, 1991 for Amiga, 1993 for DOS).
Someone has already proposed “Abuse” (1996) which would be like an advanced version of this game from Team17 (the creators of “Worms”).
Although it’s mainly an Amiga game, the MSDOS version is quite good. I remember making good progress in the game and having a blast, but I don’t think I ever finished it.
According to Wikipedia, there are many later versions divided into two “eras”:
First era:
Alien Breed (1991) <<<– This is the one I’m suggesting
Alien Breed Special Edition ’92 (1992)
Alien Breed II: The Horror Continues (1993)
Alien Breed: Tower Assault (1994)
Alien Breed 3D (1995)
Alien Breed 3D II: The Killing Grounds (1996)
Second era:
Alien Breed Evolution (2009)
Alien Breed: Impact (2010)
Alien Breed 2: Assault (2010)
Alien Breed 3: Descent (2010)
So there’s a lot to talk about with this game (including its similarities with Gauntlet and the obvious “Alien” film influence). It’s also available in GOG, so not a problem to obtain it.
https://en.wikipedia.org/wiki/Alien_Breed_(video_game)
https://www.mobygames.com/game/4217/alien-breed/
https://www.gog.com/en/game/alien_breed_tower_assault