38 is correct, 37 isn't

38) Robot Philosophy Part 2

• It's a puzzle game with lasers

37) The prequel to Robot Philosophy part 2

• It's a puzzle game with lasers, but before it was cool

36) To gain dragon powers you must slay a dragon and absorb its essence. Everyone knows that

• The most iconic of these dragon powers is yelling very loudly

Splatoon?

Still more clues.

#40

• One of this game's side characters is likely the Finnish god of water, though it's never explicitly confirmed.
• Hiss
• The Oldest House
• Federal Bureau of C________

#39 Monster Hunter World

• The highest-selling game in this long-running series focused on killing monsters.

#38 Tales of Berseria

• A remaster of this action RPG was just announced less than a week ago.

#37

• Drangleic
• Vendrick
• Nashandra
• The Sunken King, the Old Iron King, the Ivory King

#36 Fire Emblem: Three Houses

• Pick your side, black, blue, or gold.

40) Control

37) This sound familiar, but not sure... Dark Souls 3?

Correct on 40, right series but wrong game on 37.

You're a kid now, you're a squid now! And correct of course!

As several games had been found out and others timed out, time for several new games to guess:

#40: This game series from Stardock got often called a successor to Master of Magic, here in it's third iteration.

1. It's the technically the third iteration like I mentioned above, but also the first iteration, as the second replaced the first and the third replaced the second one entirely.
2. You start with a sovereign of your selected nation and build an Empire (evil races) or Kingdom (righteous races) out of it
3. If you follow the story, you'll find out that it's actually a prequel to the Galactic Civilizations series, as the planet is Altair, the homeworld of the Altarians.
4. Your units, you design, but your heroes, you recruit and equip personally.
5. If a unit dies, they stay dead, while when a hero dies, he'll be alive after the battle, but with a debuff that needs a special and expensive potion to remove.

#39: Thwart a global alien invasion with your handful of soldiers

1. It's an hommage of a series that was big in the 90's and still gets some games out now, but unlike those who mostly played in the future, this one starts in an alternate late 70's.
2. Unlike the X-COM series, here telepathy does nothing
3. You start out with assault rifles and will go over laser to plasma weaponry later in the game 
4. The invading alien fleet includes Sebillians (Big lizard-type guys with regenerative powers and poor eyesight), Ceasarians (The stereotypical greys, with a big head, good eyes and low health, later joined by reapers that are deadly on touch, robotic Androns, Drones, teleporting Harridans and finally psychic Praetors.

#36: Game over, yeah!

#35: Doublekill!

#34: In this game, you steer a character from the womb until college graduation. 

38 and 37: Portal 2 and Portal?

37: Dark Souls 2 then maybe?