I think the setup here is quite strong and intriguing, but I feel as though the way it was presented was somewhat lacking - I feel as though the story reaches the "to be continued" screen before it can properly sell us on the concept - the readers are left with the vague threat of death and magic, but don't see much to actually prove its existence beyond a teleporting cat (who the characters have no real reason to actually trust). I would have liked to get to see the witch a bit more in the little we did get of the story, in order to get a better grasp of the threat it represents to our characters.
Writing-wise, I think it's slightly lacking - the repeated spelling errors (alongside the odd font choice) make it hard to follow the story, and the characters have a tendency to be a bit too literal (the dialogue during Marcus' backstory felt a bit too stiff... though it did result in a fantastic gag about the potential umbrellas have as weapons). Speaking of the umbrella gag, I do think the story's sense of humor is one of its strong points - there's some very solid gags here, though it does make me wonder if the story will keep them up when things get more serious, or if it'll fade away as the characters realize the severity of the situation at hand.
Regardless, I'm looking forwards to seeing what the story will look like when more of it is out - but as for now, I'm left wanting more from what we got.