I would nuke the kitchen island, or move it to be the "handle" of the peninsula so you could have a little more space in front of the oven.
Change the swing of the master bedroom door so it doesn't block the bathroom entrance.
The master bathroom entrance wastes space the way it's drawn... You could probably push that door to the right which leaves more useful wall space in the bathroom.
If that's a jetted tub in the master bath, be sure to plan an access panel for servicing the pump, which will be spec'ed by the manufacturer. (Ours is in the master closet.)
The door from the guest room into the guest bath is going to hit anyone using the sink. Either change the swing or make it a pocket door.
I'd give a little more space between the sink and toilet. What's drawn is probably ************ for code. Check out page 44 of
https://bulk.resource.org/codes.gov/tx_residential.pdf (Or more appropriately the NY one, although they're all a bit out of date.)
I agree with nuking even the half-wall in the living room. It doesn't do anything more to define the space than the couch does and it only limits your flexibility.
I'd think about making the guest bath a little smaller to make that entrance hallway next to it a little bigger. Just a few inches so that the door can swing a little past 90 degrees and you get full use of the opening.
In general, mentally walk through every door and use every appliance and think if there's any way you could make it easier.
Looks like a cool project!