I know I'm repeating what others have said here, but in some places the rhyming sounds forced. Try perhaps cutting the rhyme altogether, or playing around with rhythm instead, and you could get some interesting results. 
Places where the lines don't really rhyme:
After three years, I had it all planned,
Outside of the prison there was a wide grassland.
I slid down my sheet, into the grass,
Slippery and wet, and covered with moss.
Also with this one:
Finally, the expected night had come, a storm rages,
Outside and I reviewed the plan I’ve had for many ages.
'a storm rages' may rhyme, but it doesn't make sense here. This is because it is in present tense, while the rest of the poem seems to be in past.
My favourite line was this:
Into the night, I flew unseen,
It's simple, but it sounds good, as well as providing us with action.
So, overall, I would say that it's a pretty cool topic that you've tried to write about. Just remember that poems don't need to rhyme, but if you do decide to do something with rhyme, don't force it; let it come naturally and it'll be a thousand times better.
Keep on writing, Pros!
Kay.
(Critting for the Cabassi...
)
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