It is for sure one of the best fanmade game for Undertale universe. Most of the times you can feel that this is, well, undertale style.

Story was pretty good, sometimes you need to think of what is good and what is bad from different perspectives (main character or monsters). Especially pacifist route is a main source of lore here (tho if you want full perspective, you probably need both neutral and genocide route).

Game is harder than original undertale, however there are many options which can help you with your journey available in options, which is a good thing, because more people can enjoy the game.

Songs from this game are really cool and fitting to the universe. Same as artstyle (with one exception, but i'm not gonna mention it cause of spoilers).

The issue tho i had with this game is that some parts of the game are a bit different from others or you can say they are not fully polished. Or at least I didn't enjoy them. Also some attacks are changing depending of RNG, which can be sometimes annoying, when you take extra damage, because attack spawned directly on you.

Still, this game is for sure worth checking, especially that it's free.