The game is going to be quite long, with the dev (Selebus) confirming multiple endings including bad ends, "purity route" ends with each main girl, and a true ending.
No ending is in the game yet, as it's actually fairly early in development still.
Personally, I'm happy it's going to be long. The character writing is phenomenal, and I love the slow buildup to things happening with each of the characters. Big character developments are foreshadowed long in advance, but its often only likely to be picked up on if you're familiar with what that character's going through or in hindsight.
If what you meant by "doesn't look too good" is the prospect of a happy harem ending, yup. This is a denpa game. Think Higurashi or Doki Doki Literature Club.
I wouldn't expect the first ending we get to be a happy one.