Started with full life
Took a gunshot in the face
Only half life left

A talking deathclaw
Tom Baker's robotic dog
Nice writing, Black Isle

I was a hero
Took an arrow to the knee
Now I am a guard.

Aliens attack!
I wish I could save us all
But I'm out of coins

Manhattan Project:
This time in 2.5 D
Chew gum and kick ass!

Three dunks in a row
Turbo, red shoes, he's on fire
Boom Shakalaka!

I've unsuccessfully tried to make one about the Duke for a while now and I must say: I really really like this one!

I'm the big hero
Townspeople give little help
Do they WANT to die?



(An allusion to an oft-used game mechanic: everyone knows you're the one who's going to save the world, but they still charge big money for the stuff in their store inventory that will ultimately lead to their survival through my efforts. "You are the Chosen One, the one with the power to save us all from Hell on Earth. Without you, we are surely doomed for eternity. Go forth, for the people of Wonderlandia! Oh, almost forgot - that'll be 414 gold for the three healing potions, please.")

Five dollars later
My horse is wearing armour
Microtransactions

I've to feed my child
Or feed my child to Sauron
It's your call, "Hero"

(I love it, though, that's a great observation.)
(Also disregard that haiku, it's rubbish.)

Red face on my screen
The Guardian is laughing
Something is amiss!

Avatar, help us!
Britannia is in danger!
Enter the Moongate.

Going into the dark,
With hope and steel we march.
Torch wanes with screams.

These are not connected.

Coincidences
Paired with wishful fanboy talk
Half-Life 3 confirmed

She beat me with Dan
Tekken's better anyways
Who mains Hibiki?!?

Start up the tape deck
Load, 8, 1
Joystick in port 2

Adventure logic:
Put honey on the cat's hair
Make a fake mustache
(Bit inspired by Idle Thumbs, that one)

Paid for a space base
Scammed on Kickstarter again
Et tu, Tim Schafer?

No point going on
Other waifus can't compare
There's just Monika

Searching for Cheryl
All I can hear in the mist
Is radio static

I'm having a blast
Playing Sakura novels
I can't even read

A radiant shine,
Screams as they're forced to combine
"Oh shit, it's the Trine!"

Even when I sleep
I just see tetrominos
Though my eyes are closed

Despite the Creepers
We build our own happiness
Brick by brick by brick

Yesterday I died
In monochrome depression
To hunt the nightmares

A casual look
But the gameplay is vicious
Cook, Serve, Delicious

A curious god
All I want to make them do
Is drown in the pool

"Games are art!", I yell
As I beat up luchadores
With a large dildo

Mario's on mushrooms
Waka Waka Power Pill
The 80s were wild

I beat Solitaire
I've got all the achievements
True hardcore gaming

That's not exactly right.

Why No 5-7-5?
The Urban Myth of 5-7-5

Here are some examples of haiku, many of which do not follow the 5-7-5 pattern (in English at least). I am by no means a haiku expert nor am I fluent in Japanese, but I'll give it a shot.

Deus Ex
with a mere mention
install again

Though I think 5-7-5 is a nice form to play around with, let's try this. I must say the restrictions on content compared to form make this a lot more difficult.
I quite like your take on it, that's a high bar right out of the gate.
Okay, let's give this a shot:

~~~

Snow covered fields
Her silhouette in sight
Love on the battlefield

Footsteps
Previously unheard
Quicksave

Quo vadis, Leon?
To mash a button
Evidently

I really like those. Nice job. :)