oh, that's cause of the aspect ratio. I recommend playing the game in a window with a short height and long width for best performance.
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I dont know how to not sound like a dick while saying this but..... That seems like your problem to fix, not mine.... you are the developer, you are in control of that. Having your camera scale correctly and being able to see upcoming things before you are right on top of them is important in a platformer.
A FOV slider isnt that hard to make, I can help you with it if you need. Looks like you're in Unity.