I just finished playing the demo, and I have to say—I loved it! It feels both familiar and unique at the same time. I can see the developers' love in every room of the game.
I really liked how the demo ends; it left me eager to find out what's happening in the mansion.
Congratulations on your work!
I played the NES version and absolutely loved the color palette and the many easter eggs referencing Maniac Mansion.
My only suggestion would be to add the control guide inside the menu (Start) and assign "quick switch" to the Select button, just like in the NES version.
Wishing you success, and see you on Kic
kstarter!