Not sure how much help I can offer or how useful this information will be to you, but from personal experience UI options are pretty limited.

I used to love playing CIV, Age of Empires, the Sims, SimCity, however I can't really play them anymore as I can no longer read the UI.

It takes me a lot longer to learn how to play a game as quite often I can't read the text the tutorial is giving me. Most times I give up as my eyes start to sting from straining g them.

Ammo refill bars as well as HP bars are always difficult to read or locate on occasion, which is frustrating.

There typically isn't great colour blind "modes" either.

TL;DR
Larger UI customisation/font

I second the Ui and font size comment. GTA is a pain in the ass with all its small fonts and so are many other games. Battlefield Hardline had a great system that I could use to make all the objs bigger but also my teammates names. Now in BF1 I can't do that and it becomes a pain in the ass to ID my teammates. I don't care if it "doesn't look quite right" to the developer, it makes all the difference in the world. I used to love the ace combat series until a game came out and I couldn't see the lock on indicators anymore so the series died for me. Also wtf is with so many devs using red and green to differentiate enemies. It is literally the most common colorblindness around.

Best place to start would be $1

The audio games forum has a very active populace.

As an accessibility trainer who is totally blind, I find it helpful to break down vision loss into a few categories: people who have the ability to use the internet without any screen access software, people who use screen magnification software, people who alternate between using magnification and not using any at all, and people who rely solely on screen readers. For your first game, my advice would be to decide who your target audience is going to be. Are you looking to make your game accessible to use with screen readers? Are you thinking of a game which addresses the low vision crowd? Could you find a way to include all types of visual impairment? Two examples of games which cater to all types of visual impairments which immediately come to mind would be A Dark Room and King of Dragonpass, both of which are on iOS.

I really enjoyed Celtic Tribes at the beginning, and I know there are other games like that on the app store. The thing about Celtic Tribes that stopped me playing was this. When you get high enough to make it into the top ten alliances of the game (and I did make it that far), the way that most players in those alliances gain momentum and continue to make their empires stronger is by conquering other players. I found navigating CT's map to be too tedious and time consuming. In a web based game called Nation States, a similar challenge befell me. The region I joined liked to invade other nations. They would mass invade several regions within the span of a few minutes by flooding the nation with endorsements for an opponent. I found Discord, the chat system my region used to coordinate, to be hard to read using my screen reader at times. Additionally, I couldn't get to an enemy region's page fast enough. I probably could have done better given more time, but struggling to keep up by navigating using my screen reader while everyone else could just click click click didn't sound like my idea of fun. Another instance in which speed was a significant worry for me was in Pokemon Show Down. I found its concept to be appealing, and I have a blind friend who plays it. But I don't know that I could keep all the details of a match in my head and still make a move in an efficient amount of time. I don't have a good memory for finer details.

Text based choice games are nice, but I feel that there are quite a few on iOS already. Still, I've played some awesome choice based games: Life of a Wizard, the Hero's Rise Trilogy, Alter Ego, and Choice of the Cat are some of my favorites. I loved Alter Ego because I had always wanted to play The Sims. I figured that game was as close as I'd get to playing that. I would have loved Rollercoaster Tycoon if I could see. I would have played Pokemon video games. To that end, I play a similar accessible game called Crazy Party. They have a section called battle mode, and their cards are similar to Pokemon cards. Lastly, Eve Online is a game I've really wanted to play. I find RPG's to be appealing. My husband plays and has told me all about it. There's actually a thread on their forums where my husband asked Eve's developers if they would ever consider making their game accessible to the blind. The response was realistic but wasn't very encouraging.

Hope that gives you somewhere to start.

And see it's funny cause I have no real concept of "red" meaning stop or danger. If a game was designed that allowed me to customize enemy color indicators I could make the game perfect for myself. For example, in Ghost Recon wildlands, the Unidad forces are a blue/purple color that I can see very well in pretty much every environment. The santa Blanca on the other hand can be very difficult to see not to mention that rebel and enemy indicators are pretty much the same to me. Being able to customize that would have been a huge QoL improvement for me. I'll say this Ubisoft is pretty terrible about these kinds of features. I basically have to hope and pray I'll be able to see the UI in a new assassins creed game. Thankfully they have stayed pretty monotone throughout the years

Video games for the Blind:
All I can say is keep it simple at 1st. Design a simple game close your eyes and test the heck out of the product.

Blind Simone: Released this back in 2014 on Google Play. Still on amazon for free

https://www.amazon.com/Asylum-Bound-Games-Blind-Simone/dp/B0775X1762