Hi, this screenshot is from the demo, not the final game. But they both were tested and confirmed to work on the latest version of Mesen emulator. They were also both tested and working on the original North American Nes ntsc and european pal nes. The game use flash save technology for saving and that is not suported by all emulator (it works on the latest version of Mesen) it is also not suported by everdrive cart. The game will play on everdrive but not save. The physical release of the game (available soon on Broke studio online store) works on original nes console and does save.
The game was designed around the nes mapper 30 and from what I understand (I could be wrong) does not support traditionnal battery save, only self flashing save. Which means that if the emulator does not support flash save, in game saving will never work on this emulator until they release an update that support self flashing save. Sorry. We will update the itch page to make this more clear.