Good little game so far (if you cont it without the sex) (as i couldn't find it).
The graphics issue could be that the game is made in Godot and as that engine is newer, they did not think about supporting older machines.
Even if there's a compatibility workaround, maybe that does not work for all older hardware.
A tip from me would be to use machine learning to improve the AI even more.
https://godotengine.org/asset-library/asset/1629
https://huggingface.co/learn/deep-rl-course/en/unitbonus3/godotrl
For some reason there is 2 different versions of the same thing... but you're the developer, so i will just wait and see ;)