Controls are horrid. Battling is frustrating. No matter where you click, be it right or left click, it takes an act of Congress to actually attack. Also, even with my 32 inch 4K monitor, the characters are tiny. How about scaling the game instead of forcing a resolution? Sure, you scale the map display area, but the characters are teeny tiny little sprites still. Despite there being a whole heck of a lot of nothing between event areas, there has got to be a better control system that doesn't demand pixel accurate mouse locations to do things.... like attack.
Before you work on anything else, work on the engine first as the rest won't matter if people need magnifying glass and GPS to just play the thing.