Eh, I fell asleep after I got home today.
Let's remember all the time we've had
To make a difference
Now, these two lines could have two very distinct meanings which aren't subtle in any way:
1. Let's remember the time & the time was used to make a difference.
2. Let's remember the time because remembering makes a difference.
Pick one of them and clarify what you mean.
We've wasted it all on the greed that has been taken
It's a point of void acceptance
How do you take greed?
"Void acceptance," while sounding cool, doesn't seem to have a meaning.
Let's try to remember all those moments that we've shared
The sunset grows red when it wasn't so blue
It's now all gone in a flash
Why the switch from "let's remember" to "let's try to remember"? I think with repetition, it sounds better.
Second line makes no sense. It also switches from present to past tense half way. What are you trying to say?
How did this happened?
When it was so peaceful
How did this happened?
When everything wasn't so vague
"Happened" should be "happen" because 'happened' is a past participle and doesn't belong in that question. Past participles should only be used as adjectives or after the verb 'is' as a passive-voice construction or 'have' as the perfect tense. Due to the nature of 'happen,' I don't think you can use passive-voice with it, but I am not thinking clearly right now. A correct question would be "How had this happened?" but the way you have sounds better (if you fix the grammatical error).
You should try the 'show, don't tell' rule on the second and fourth lines. Right now they seem bland. Try to think of some words that embody "peaceful" or "wasn't so vague" and describe something with those words as a metaphor.
In that second your emotions were so blank
It was like staring at a stone statue
You're giving no clues
You're standing so still....
Technically, what the first two lines mean is that the emotions were comparable to staring at a stone statue, not "Because your emotions were blank, looking at you was like staring at a stone statue." albeit in a more melodic form. You should reword that second line.
I think the repetition of "you're" in the last two short lines is unnecessary. The poem ends more strongly with only one of the lines. Remove one.
- - - - -
It's a reflection on an unsaid plot and therefore, it may need some more clarification. Build more deeply into the emotions of the scene.