Admittedly not being the biggest Visual Novel fan in general, two things that will attract me to one is a nice premise and cute art. And while "kids go to spooky house" doesn't tell me much, this has the latter in absolute spades. What an adorable cast.
I did like Rosmary's brattiness being reigned in enough to feel real rather than cartoonishly mean. Enough for me to repeatedly go dad-mode and tell her "Come on, be nice to your brother", but not enough to get sick of her crap. Very adorable.
I understand this was a Jam game, and there is always the matter of time constraints, but the main thing this is missing is a bit more music and sound, and absolutely some ending graphics for the surprising amount of endings. Some of the otherwise interesting payoffs end up falling a little flat without them.
But still, a really good effort. And definitely props to your character artist, these were great.