I finished playing the demo and this is easily one of the best-looking RPG Maker games I ever seem! I didn't even suspect it was made on RM when I first saw it.
It's very easy to get immersed in the world you created, I found myself admiring all the locations and the implications of the visuals very fast. It helps a bunch the cutscenes have a lot of effort put on them and the existing characters grows on you pretty quickly.
The animations are amazing too! I love how on top of the backgrounds having a lot of personality, all the characters have multiple idle animations that helps you getting attached to them even with the low amount of talk we can actually do in the demo. The random bandit having a special battle animation made me giggle, good stuff.
I have to say I love most of the charming alien ladies and I'm also a sucker for post-apocalyptic scenarios, so this game pretty much has me covered from every angle lol
Being a solo dev is though and your project certainly seems like a huge commit, but I hope you can succeed on making Frozen Soil possible! I will follow the game for sure!
Good luck and thank you for the great demo!