For v2.2.2 and following releases of RBA I plan to add a few additional features that don't require a breaking change.
-- blink (lets player teleport on a seen tile)
-- blizzard (freezes monsters and water for a few turns)
grot and mines need a bit more interesting layout
make use of prefixes for equipment that have already implemented in v2.2.0 but are disabled right now
visual feedback for status effects
maybe some mini boss monsters
-- For example I plan to add medusa to the grot (she spawns inside a temple and can immobilise the player with ranged attacks if he/she isn't blind while batteling her
-- can be droped by bosses
-- are worn in a special slot
-- give you a permanent status effect or can be activated for a special action (maybe we need a new key-binding for this feature)
-- example: "Medusa's Head" is droped by medusa and can be used to immobilize a single monster. After every use it has some kind of cool down periode
-- destroyed demonic mirrors in deep desert underground will open a portal into a hell dimension that collapses after a few turns
-- inside this dimension the player has to face demon knights and demon priests which drop demonit equipment
-- after a fixed number of turns inside hell dimension player will return to the location where he/she entered the portal
-- drinking from puddles ect adds a bad status effect on the player so this option is only some kind of last resort
-- fountains are save but dry after drinking (they will regenerate water if a water source is near by)
-- possibility to fill water in bottles
-- you can use a furnace to make bottles with dirty water save (or maybe not)
more slots for misc items
more decorative clothing
I think the number of changes that are possible without breaking save-files shows that RBA is on a good way to become a suitable base for mods and alternative variants. With v2.3.0 I plan to make monster abilities and player status effects more generic. So adding one of these will be no problem for save-files as well. I hope v2.3.0 will be the last version with breaking changes for a long time.
Ideas and comments on this topic are very welcome!