Thank you for such a detail feedback!
I think remap keys might be possible. It'll take me some time to research. Can't promise if I could implement this or not. For now, you can press F1 and play with the settings there.
The real-time combat is cool, we've tried implementing it before but it caused some annoying complicating bugs, so we changed it back to turn-based system.
I use an old version of the game engine and it doesn't support the resolution of the wide screens nowadays. Changing the engine will increase the cost and consume more time, so there's nothing I can do about it.
For the save slot, I'll see if I can add a few more slots.
And I'll also take a look at the other things you pointed out.
Thanks again!