So we will be using reshade with sweetx. I will be linking the download from my onedrive, just click download on the link and then copy the contents of the folder to your game install location where the .exe file is stored. For most people it will be C:\programfiles(x86)\steam\steamapps\common\nex machina.

Once you drop the contents in that folder you're good to go. You should get some text in the top left corner when you first run the game telling you the effects have been loaded.
You can press scroll lock to toggle the effect off so you can see the improvements.

If you wish to tweak the sharpness some more then go to the sweetfx folder and open sweetfx_settings.txt. Near the bottom of the text file you'll find a setting called Lumasharpen. I have it on 5 but you can increase or decrease it to what you want. This can be done whilst the game is running so you can see the change happen in real time.

Link to reshade file with my settings.
https://1drv.ms/f/s!AouyCG5EmVlD5DT9nKqy6xA9e_Rl

Please go to this link and move your mouse on and off the image to see a direct comparison.
http://screenshotcomparison.com/comparison/113517

Credit to Mr. Hugelberg for the images and link.