I think i have found it. "The Unholy War", released in 1998 for ps1.
https://en.wikipedia.org/wiki/The_Unholy_War
Features 2 modes of gameplay, just like you said.
I think the first game you are looking for is "Blood Will Tell", realeased in 2004. Here is the wikipedia page:
https://en.wikipedia.org/wiki/Blood_Will_Tell
I hope its the correct one!
Its not dark colony (but very similar) :(
You control just one of the soldiers, and kill aliens to earn credits. You can use the credits to call reinforcements, one of the reinforcements is a ship that drops 5-6 soldiers into the battlefield.
Hello! One of the games you are looking for is "No.5" and information about the series can be found here:
http://jayisgames.com/review/3wish-adventure.php
If you just want to play it again, i have found the game in this page:
http://www.purely-games.com/ufo_escape_game.html
Have fun...
I think the game you are looking for is Enclave. You can see the staircase part here: https://www.youtube.com/watch?v=ZpCtFK1XhBM
At 7:44 in the video.
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