I like the concept and the actual animations instead of just different PNGs with text. Almost all my feedback is stuff to tweak or at least consider for the future, I am aware that this is a very early/demo version but I prefer to point things out early on. A lot of this feedback will read negatively however, I hope that most of this is taken for the constructive criticism that I intend it to be. This game looks like it could be very good once it is more fleshed out.
Controls - I would love for there to be WASD movement, not sure if possible in the game engine. Movement speed could be 10-20% faster while dashing as the maps are quite large.
Navigation of world - Those little green circles need specific triggers for if there's something to actually do for the player inside of that area, don't want to have to try every building door just to see the default "can't open people's doors" text and then re-check after every progression event. Also as a note, the game world is big and I suck with directions so a warp to X person or even just a ! box on the map to lead me to phone message events/quests/objectives/new scenes would be awesome.
UX/UI - still in the demo phase however, a hotkey for checking the phone screen with all the girls in one button press would be good. Also the menu and phone icons are clipping around the blue box in the top right, maybe move them to separate sides of the screen.
Battle system - Never played Fire Emblem so can't compare but there are a few things that could be tweaked. If the only outcomes are win or lose with no option to retreat, why not have an option for quicker fights where it is just "X girl won and took Y points of damage" or "X girl lost". Once a girl has been used, remove her name from the list. For the other village forces, an indicator to tell how many times they've been used to allow for min-maxing. Once all the girls have fought, a pop-up option to use the crystal right away instead of walking to it. Ideally I would love for the goblins to line up in columns so that I can just cycle through them instead of walking around to fight them all but that is more just wanting to get this part of the game over with faster.
Animations - They are good, about what I expect for not spending 6+ months per character per scene. Would love to see an option for x-ray shots during blowjobs and the eventual pregnancy scenes. Also had to play muted so I am not sure if there are any sound effects but if not those would make the experience 5X better. I am always in favor of quality over quantity so hopefully each scene for each character is different enough to not seem like a copy/paste.
Characters - If nothing else this is where most of the issues with the game are for me. I am not sure if it's just me but all the girls are mostly the same and that is just boring(the game Demon Deals is another example of this). Large tits, pointy ears, same mouth, only differences are skin, eyes, hair and faces. Some more variation with the models would go a long way. I get the theme of the game is MILFs but at the same time 15 girls and only 2 break the big tits and ass default is a real letdown.