I've played your game 4 times, getting the highest score of 19000 if I remember right.
I prefer games that are more "play once and win" rather than "play any amount of times for high score", so I might be biased. Also, English is not my first language and I am very critical as a person, so what I've written might appear as more aggresive than I intended. Take note of this when reading the text below. I'll first focus on what you asked for and then proceed to the other things that came to my mind.
Enjoyability: It's good enough to play for a bit. If I were back in school as a child on an IT lesson, I'd most likely be more satisfied with your game.
Controls: Controls are fine and intuitive enough.
The only thing that comes to my mind in terms of improvement is that currently if you push toward the desk and try to change direction without stopping to push, you'll either be stuck in place or move very slowly. I suppose the player input for pushing forward could be ignored when he's close enough to a desk, so that the dino is able to easily slide in the other direction.
Player purpose: I've sacrificed my first playthrough to understand what I'm supposed to do, but that's normal for this kind of a short game. Adding images at the game's page so that the player can look at the playing area's screenshot before starting the game might have alleviated that 'problem' a bit, but I don't know if it's worth the trouble for you.
AI: AI gets stuck on desks. Considering your game is made in Unity, I think this might be helpful for you. Also, it could be cool if enemies spawned with different pathfinding types - for example, one could follow behind a player, and others come straight to him.
Enemies: At the moment, enemies just block your path and can be 'defeated' with clicking left mouse button at the nearest desk and right mouse button afterwards. I think that you could add more enemy types that require a specific type of food or more mouse clicks, OR just make enemies deal damage to you/result in an instant game over if you ignore them for too long. Right now they just feel kinda like an afterthought.
Sound: I think music in the start screen should be at least 2 times longer before looping, or the looping moment should be made less noticable. At the moment it's very jarring. Also, I think there should a sound effect whenever an enemy spawns and when you feed them food. Aside from that, sound design is fine.
Good job overall.