IanG

Perhaps you could say 'at first he didn't realise the door was ajar,' as he clearly does realise eventually. Nonetheless its good for a first attempt. Your protagonist and his feelings are totally convincing.

Considering how young you are, you evoke nostalga very well.

This is a plausible, relevant story. Well done.

You describe the scene and the change of mood very well.

You evokr the setting very well. I could imagine myself there.

Your narrator's loneliness is convincing and the twist at the end is good. You raise a lot of questions over the 'imaginary' friend but a touch of mystery can be a positive.

This reminds me of what the vicar said at my father's funeral. He said this goodbye is different from all the others but don't forget see you as in see you later. Not everyone will agree but he meant well and i took it as it was meant.

I like your descriptions at the beginning. Its common for authors to change their minds while doing first drafts of stories and good that you're self-critical. Perhaps you could've described the boy's escape in more detail, it would've added excitement, but overall its a good story.