Thank you for playing!
First let's go to the bugs; you're the second person to mention you couldn't click "Finished" when designing. Do you remember if you were creating a dress, or was it another design? Was it in Clients mode, Freestyle, or both? Are you running version 1.3.1 (click on the FAQ to check)?
Also, to make things easier for you; you don't need the exact shade of colour to complete the designs! Colours are grouped into main colours, so you've got your blues, reds, yellows, greens, etc. It doesn't matter if you need a dark orange or a light orange colour, both of them will count :)
To skip dialogue, hold down your left mouse button, or hold down the space key, this should speed you through it.
As for having more save files, that would be a no. It's okay though, you can still achieve what you'd like to do! The game runs on a single save file and you can always switch character routes whenever you'd like, and re-read chapters you've unlocked. When you've finished an ending, you'll be prompted with the choice to read from Chapter 25 again where the route diverts to read the other ending and unlock it. If you choose no, you can always go back to chapter 25 yourself later on to get the different ending. This way you can get all of the CGs and all of the endings without much hassle.
You still need to pay for the chapters you haven't read yet though!
Also, you're correct that Angela's dress is gold, but the dialogue says red. I got it fixed now :)
Thank you so much for your feedback, I'm glad you enjoyed playing through Neil's route! Dimitri might be less to your liking since he's not cold or aloof at all, but give him a try either way!