This was a really neat premise! I explored and crafted up a bit for about 24 minutes but didn't find any more gate stones yet... I would have loved a lot more banter between guildies to make it feel more MMO-y.
I found Elfadin pretty useless so swapped her out to use both Razr and the ninja. Ivy died once early on so I had to go back early, but then quickly on the next outing she got Snow Front and the game was sorta over for these slimes.
A more refined verison of this concept could be very cool!