IF they can. This is an RPGMaker game, so they may be bound to Windows like it or not. With that said I imagine it's a fairly simple engine to emulate in function, given Zeboyd games and Ash, and it isn't unheard of for indie RPGMaker games to be remade into the developer's own engine (Corpse Party).
I'm fairly sure Ash was done with RPGMaker. At least, they used some of the stock art from RPGMaker. My girlfriend is playing an RPGMaker game right now, Deadly Sin, and I noticed that many of the enemy graphics are the same. So maybe the Ash team ported the engine over to iOS?