Gamedev1909 has announced that the best Nintendo Switch emulator, Ryujinx, can now run some 2D games with almost constant 60fps. These games that are already working great with Ryujinx are Puyo Puyo Tetris, The Binding Of Isaac and Cave Story.
Source: N4G PC The Nintendo Switch emulator, Ryujinx, can run some games at almost constant 60fps