I don't know how much time has passed, but I'll give you a report on the last couple of months of active work.
Phase 0:
For this phase, I've reworked Sans's previous character concept. In the previous scenario, which only I knew about, he would have cried in battle, but after careful consideration, I've decided to transform his character into a more familiar Sans. There's no progress regarding the battle, as we only have one coder who does something once every (insert number) years, but I'm not complaining.

sprite by me
Phase 1:
from the main - I've redone the battle concept, the battle is no longer survival, but a full-fledged step-by-step battle. I've also made a lot of sprites and am writing music, which I can't show you just yet. I've made a couple of concept attacks and a special moment that I'll discuss in the future.

sprite by me(wow)
Phase 2:
The core has become probably the most modified place in the whole game, where, in principle, there will be gameplay in addition to the battle with Sans, but I'll tell you about it later. For now, I'd like to tell you about what has been done in Phase 2. The main thing is the animation that I've posted in other posts. However, the design of Alphis has also been changed, and the design of Alphis Neo is being developed. So, here it is.

sprite by me(again)
Phase 3 and 3.5:
the battle concept has also been completely reworked. There are many interesting ideas about phase 3, and I really hope that they will be released. The main thing is that Sans has a runny nose from his eye sockets...what?

-Man, this is not a healthy thing, go get checked out
I can't say much about phase 3.5, as it remains the same.

OverWorld:
sooo, we have a new Player, yeah!

(demonstration by me, running player by @banane-lucie
)


Just Papyrus and flowey
















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