Hey. Most of the changes i want to suggest to you will be dialogue, but i have some other suggestions for some elements of the map as well that i will include at the end. A lot of the dialogue was a little clunky and did not sound like what someone would say naturally, but english is not your first language so thats understandable. I will show my dialogue changes in bold or strikethrough, and try to explain them in [brackets].

"Looks like our eggheads opened a portal to hell or something.." [Missed a word]

"And Now these bastards are eating my men!" [Extra word]

"I've hid some stuff under the reactor labs roof.." [Hided is not a word]

"Don't think we're getting any help.." [Keep present tense]

"We were so close.. to success.." [to success is implied]

"But everythings gone to hell.."" [Keep past tense]

"The mutation is unstoppable, but this experiment must be completed!" [Combine these two into one message, and extend its time shown by a couple seconds so it can be fully read.]

"Use these coordinates to locate the power cores.. [shorter and more detailed for the player]

"I feel my mind slipping...tell my family I-AAH@#$" [The original line sounds very proper and calm, not like the man is scared and dying. This is just a suggestion that sounds creepy.]

"While the Delta Core protection case is under repair, i've installed a temporary laser grid." [Again I would combine these into one sentence and lengthen the message a couple seconds. Also removed 'temporary', it is implied]

"It's kinda unstable, so reserve lasers are always ready." [Comma]

"Just DON'T TOUCH THE LASER EMITTERS." [Changed 'and' to 'just' to relate it to the last message more. Added CAPS to emphasize this clue. Missed a word 'the']

"I don't want to fix them again and clean up your blood!" [Makes more sense]