I hate dogs.
Nah jk but no other than the Dog most of those have been suggested and thought about. - well, maybe not the like "Stronger beginning" - unless Easy mode does something along that line - but the customers or whatever kinda thing, that's been played with from multiple angles, the mines being expanded - multiple layers of mines or what not. Making your own grips is planned, I believe, and Geoff (the other shop) has better prices. ._. Every grip you can buy in delivery, is cheaper at Geoff's - plus he has the cheaper wooden grips (1 and 2 coin respectively) - Although, Wooden grips are literally that value, while the cheaper grips at Geoffs are legitimately cheaper, and will get you a few coins more profit.
Geoff also has unique Guards that you cannot buy through delivery. - Not many, yet, but that's likely to increase over time, Likely you'll be able to make these all eventually, but delivery will probably remain limited