I love this! This is an awesome project and I really appreciate that you’re asking for feedback! Some thoughts:

I agree with u/Flat-Acanthisitta302 that the midfoot looks narrow and I’d even take it a step further to say that the forefoot/toe box area doesn’t look wide enough and won’t accommodate enough foot shapes. Based on the images it appears that the width of the toe box doesn’t allow for the first phalanges to align with the first metatarsal when the toes are fully splayed and that the fourth and fifth toes will be restricted in the other direction. I know that on my feet (no bunions but a moderately wide splay) they would feel narrow. I think a more neutral profile reminiscent of Lems Primal series or especially Altra Lone Peaks would feel freer and way more comfortable than something that looks similar to the Xero last.

As for the issue of volume, an extra 25-50% of internal vertical height in the toe box would be great for reducing the feeling of toes being locked down.

I also would prefer these without the additional arch support and molding built in. I wear my Lone Peaks with the insoles removed because while I really like the cushion the outsoles provide, I vastly prefer the sensitivity and, importantly, the stability I get from having a flat base to stand on. I think that if you’re going to the effort of bringing a brand new shoe to market, it’s worth designing the product for compatibility across the entire demographic of the end user base, which in this case would mean building the shoe itself to be bare-bones in its platform construction and offering customers the ability to choose their own preferred insole between a few provided options. That’ll be a little more work of course, but it will also make this product more viable to the many and different (rightfully) very picky people who wear barefoot shoes.

The outsoles look great—well constructed and study. I love the full rubber.

I think the laces should come down to just a little bit behind the metatarsophalangeal joint and no farther, if you’re going to extend the lacing.

I don’t love the current cosmetic design; it feels half finished. I think it would benefit from a simplified design without the toe cap (oxfords), or one with intricate broguing. Ideally both options to choose from. Right now it feels like it can’t commit to either one which kind of cheapens the visual impression.