Okay, let's see...
For starters, first person narrative is actually very difficult to pull off. I recommend you stick to 3rd person, that way it's easier to keep the story compelling.
Try to add more detail, and add stronger paragraphs. With one sentence per enter key, your story sounds more like a script than actual prose. Let me re-write one of the sentences.
Instead, try something more like this:“Hey don’t look at me!” his lab aide replied putting her hands up in surrender, “You’re the one who didn’t show up last week!”
I didn’t like his aide, she looked like a Poochyena and had eyes like a Spearow.
"Hey, don't look at me." The professor's aide replied in a manner-of-fact way, putting her hands up in surrender. I never liked that aide, she was always in a bad mood and had the face of a poochyena with the piercing glare of a spearow's. "You're the one who didn't show up last week!"
Also I bolded where you were missing commas.
Another thing regarding the protagonist; I'm not sure if you intended it or not, but I can't blame the aide. He was rather rude barging in like that and getting upset that the professor was gone. I have a hard time sympathizing with him disliking the aide that way.
Always read out loud what you write. If something about it sounds off chances are there's some sort of mistake.