Technically, you did return to the kingdom. Would it have been better if you played as Reiner and fought in the battle? Maybe. But it would’ve just been a longer two-hour update with the same three scenes (possibly one threesome with Samantha and Farah) you got at the end anyway. And then people would complain there weren’t enough scenes in the game. I can’t please everyone.
Yes, why not? Both are projects with disappointing endings—mine included. I won’t pretend the ending is great, because I agree it’s not. Could it have been better? Sure. Could it have been worse? Absolutely. Did I do my best? Debatable. But hey—it is what it is .
By the way, I see the little jabs you're throwing, but they don’t bother me. The fact that you enjoyed the game up until the bad ending is a win in my book

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Oh come on you know exactly what I mean...
Your story buildup doesn't match the ending and it's not a last minute "twist" it's just fuck it we stop here and the player notices...
There are lot's of media, film, games, books, whatever that just stop, or everyone dies or it remains unconcluded - that's fine.
The difference is the story are build up differently or there is an actual twist.
If you got a hastly wrap up in, let's say tv-series, people notice, hate it and complain about it...
I get it from a developer perspective, wanna finish the thing with sort of an end and move on to make better stuff.
We've all been there...
Proplem is, you got players invested, they like your game and then, bam huge disappointment - that's not how to get a fan following, in fact you probably burned a lot of potential followers for future games with that.
My "jabs" shouldn'T bother you, I'm just an old guy, hating it when devs don't their shit right, no worries colleagues get fire when they fuck up big time avoidably as well, nothing personal, nothing to take serious.
Well it's not a win for you, cause you're on my list of time wasters now.
And yes I'm one of those bastards, who buys games they enjoyed (if they are for sale that is).