Castle

You're wandering around
An unlit hallway
No doors to let you out.

You think you're stuck,
That you ran out of luck.
But you found your way in.
You'll get back out, again.

Can't find a single soul
In this empty castle.
The way out, you don't know.

The torches are burned down
You found your way to the dungeon
Now you walk with a frown.

You think you're stuck,
That you ran out of luck.
But you found your way in.
You'll get back out, again.

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Not sure what I don't like about this, but something's missing. The rhythm seems a little off, and I'm not happy with the last line in the second to last stanza (Now you walk with a frown). I think I only put frown in there to make it rhyme. I also think it's a tad short, but that can't quite be helped.
Any ideas?