I do not like Harvest Moon games, but I loved the combat system of Rune Factory 3. Rune Factory 3 has the best system for Action-RPG (or hack and slash) that I see in DS. We can use many weapons (short sword, long sword, dual blade, spear, brawling...) and evolve skills of each weapon. There are many interesting spells that we can use and evolve each type of spells (fire, water, wind, dark, light, cure...). What kills the game is the Harvest Moon part. We have to do repetitive boring tasks: sleep when it is night, collect items (or farm) to sell and get money, do boring requests/quests to grind in the dungeons. The enemies of the next dungeon are too strong and we need to grind. My suggestion is the creation of an ARPG game using RF3 engine. I have no knowledge about rom hacking. I believe that the three games have 1 town and 5 dungeons (4 dungeons represent a season). The number of places is small for a complete common RPG game. The towns and dungeons from Rune Factory 1 and 2 should be imported to the hack in order to expand the game world. Then, they would be combined in a way to create a story and a sequence of places where the main character will visit. With a larger world and a true story, the character would get stronger while the adventure progress without grinding. The RP bar should be MP instead of decreasing with any action, such as physical fighting and cooking. I died while I was cooking because I lost all RP. The time should be stopped without calendar, the day and night cycle and rain would have only aesthetic effect.