you can also use wasd and z to do this. the reason why I don't have the ability to use a normal mouse as that wasn't a normal Gameboy peripheral. as the engine I used can only use what was commonly used for most Gameboy/Gameboy Color games. below is an image directly from the engine to assign the key bindings. also, mobile would be completely left out as it does have the emulated buttons and ignores keyboard controls.
that is a common scene type for the engine to do a point and click.
the engine I used is GB Studio