Thanks for the feedback and glad you liked the game.
You’re not the first to miss or forget that there’s an Undo and only relying on Restart. Not sure though how the feature could be made more explicit without making it intrusive.
As to the graphics part, it’s definitely not my strength as a dev. And indeed, adding a bit of details would be the logical next step to improve that side of the game. I’ll see what can be done.