I search the controls and i read you don’t have time to implement it in the developpement… it’s a shame for a game. I think than be the first thing you need to code. The graphics are good and colorfull but not really for this era (resolution too high i think).
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For the resolution change the windows size are not the solution, it depends of your game engine renderer in unity your can change the render resolution easily, for nes the resolution is 256x224, so your sprite and graphics need to respect this maxsize (and sprite may be normally 8x8 pixels but you can cheat it’s not real nes game). And there is colopalette too… honestly with the graphics of your game, that remind me more computer game of this era, but than can work with low resolution. On old system generally transparency is not working, the graphics use dithering to made it or sprite flashing.