I didn’t realise this was by Emily Short! But it is. Though the copyright is to Lord Lobur-Bytton.
It’s an IF about writer’s block (like loads of others [like Violet]), but what makes it slightly different is that it is written rather in a CYOA (Choose Your Own Adventure) style. One doesn’t input commands, one inputs choices. There are several endings for about 3-4 choices, making it a very, very short game, but entertaining nonetheless.