I just played through the prologue/demo called Mondealy: Day One.

So far, the premise is nice and clearly Undertale/Deltarune-inspired, with a varied, colorful cast of characters that makes the game more pleasant to play further in. On the other hand, I am not quite sure where the plot is intending on leading or what's the driving point besides the two-worlds premise, as well as the some holes needing to be filled.

But there hopefully, the dev will take the time to fix and touch up on the game before its full release and see if there is anything worth in it...

And no, this game does not have dating features. The dev has confirmed that the character interactions between each others are as close as that gets.