I'm sorry for not posting the minimum specs, but the issue is definitely your graphics card. I'll include in the description that at least a GTX 1050 ti is required for 60fps. I just searched benchmarking for a K2000M card and it's at least 1/10th of the power of a GTX 1060 3GB, which is what I built the game on. I think the game still would run badly for you even without the visual effects. I could optimize for lower end cards like yours but it would take away from the visuals too much, which is sort of the foundation of this game.
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I second the suggestion to add a motion blur toggle. I understand it's part of the experience you designed, but I get a little seasick from it and it prevents me from enjoying the environment you built.
Of course if it's difficult for you to add the setting I understand, after all you released the game for free. I just think it's a worthy addition to your settings which are otherwise pretty expansive :)
I'm sorry about that, for this reason i'd definitely want to have an option to remove it. but I also feel like that would have some negative implications, such as people who hate motion blur by habit will also disable it, then my game won't look the way it is intended for those people (even though they can handle it). maybe in the future i'll figure this out, thanks for trying to play the game anyway!