Thank you so much for your detailed comments and lovely praises!
The cables do actually get neatened/visually repaired once you do internal-wiring repairs! the sparks you get stop as well! I'm afraid, due to the limited time I've set myself (to no ones fault, but my own), I have to prioritize meaningful and more impactful features...
As for the tutorial, I try to keep it as minimal as possible, the "RIGHT CLICK TO UPGRADE" popup was added last minute because some players just didn't know how to speed-up progress, I did add a Blue-box with control hints that appear, but I suppose it's very out of the way; so not many people notice it... I'm in the middle of trying to touch up the UI to make it friendlier to players.
Also, thanks for the suggestions! (albeit there's no guarantee whether I'll implement them or not)