Deltarune

We've finally had our first look at the successor to Undertale, Deltarune. I played through the first 'episode.' It'll take some time for me to form coherent opinions, so here's some ranting and wild speculation. I'll update this post as more thoughts and facts come up. I'm also going to include unmarked, HEAVY SPOILERS for Undertale and episode one of Deltarune. Beware!

Timeline Woes
Due to the characters involved and their relationship(s), this game cannot exist in the same "timeline" as Undertale. There are monsters living on the surface, yet our protagonist Kris seems to be the only human. To complicate matters further, his facial features and skin tone are reminiscent of Frisk (also note the name similarity), but his shirt and position in the timeline (recognizes both Toriel and Asgore as parental figures, has a sibling type relationship with Asriel) adds up more for Chara.

My current speculation is that we are in an alternate universe where humans were forced underground and the monsters stayed up above. Kris seems to be the only human around, a fact that is further emphasized by the fact that Susie initially keeps calling him freak.

To make matters even more complicated, there's our adorable and peace-loving companion throughout this adventure. Ralsei is a self-proclaimed PRINCE FROM THE DARK, explicitly establishing himself as separate from the Humans and Monsters in the prophecy, and yet...
... he's Asriel. it makes sense in a way, because he was also the prince of the underground in Undertale... and yet! This makes matters even stranger because Asriel is explicitly known to the world above and is supposedly enrolled in a university elsewhere. I speculate that Ralsei is Asriel from a different timeline, since this entire game seems to be playing with the idea of an alternate universe. It's still very strange that Kris doesn't really react, while Susie actually seems shocked. If my theory is true, that leaves two possibilities: Either Kris knew all along, or this Asriel doesn't look like his brother, the 'other' Asriel.

Every time I dig into the game, things seem to raise more questions than they answer, but I'm very excited to see where this is going.

One more thing, the game distinguishes the creatures from the underground as a separate 'class' of beings, referring to both monsters and humans as Lighteners. This sets the game's theme as being a typical light vs dark story, though it's up to the player whether they want to conquer dark (by being violent) or recovering the balance (by being peaceful).

Or is it? One more thing the game emphasized is that your choices don't matter. It says this several times, especially near the start. It makes me wonder if the outcome of the story will vary as much as it could in Undertale, or if it won't; Toby Fox likes to play with the conventions of the genre, so perhaps this is a play on the illusion of choice? I actually wrote an article about the way Undertale handles choices if you're interested, you can read it if you click here.

UPDATE 2-11-18: Toby Fox posted a Q&A, which you can check here:

http://www.twitlonger.com/show/n_1sqn3p9

He answered quite a few questions. Among other things, he confirmed that Delta Rune exists in a separate "universe" from Undertale and seems to imply one does not impact the other. I'm sceptical, though, because it is my belief that Kris and Susie entered another world or timeline through the closet in their school. Being a "separate" universe or timeline does not actually separate it from the story in Undertale.

Furthermore, and this puzzles me even more, he says the ending will be the same regardless of your choices. Undertale, I feel, had something profound to say about finding peaceful resolutions; it seems Delta Rune's outcome is ultimately always the same. I find it strange that Ralsei clearly states the contrary, however. It makes me wonder if this is a bit of deception on Toby's part. Perhaps the outcome will be the same in some ways, and not in others? We'll have to wait and see.
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UPDATE 2-11-18: After reviewing some gameplay footage, I have a few thoughts about the Lightners and Darkners.

After the adventure Kris and Susie wake up in an abandoned room in the school surrounded by many things they encountered on their adventure (poker cards, etc). It could all have been a dream, but both Kris and Susie remember the adventure and Susie still has her injury from the final battle.

All this got me thinking about what the Darkners really are.

Seam describes the Lightners as being Gods, but not just that - the Lightners are specifically named as the creators of Darkners and those who gave them purpose. And all the Darkners are based on manmade objects; the shopkeeper above is a plushy toy, Rudin and Hathy are poker cards, there are statues and poker chips, Lancer is a spade... It got me thinking that perhaps, the underground in Delta Rune is a place of lost toys.

Gameplay Joys
The battle system is basically an evolution of its predecessor, removing random encounters and introducing multiple party members. The interface buttons are a little small, though, which might be troublesome for people with impaired vision. I have little to say about it, beyond that I think it's great. Any excuse to hear more of Toby's musical talent is fine with me, and the added animations and in-battle dialogues add even more flavour.

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Also,

That is all.

I'll share more thoughts as more gets revealed and I take more time to do research.