Great start with developing some of the core gameplay mechanics with a top-down shooter! Our team made one as well and I was new to the genre, so I was on a similar learning curve with the player tracking the mouse, enemy AI and aiming, etc. If you want to continue developing it, feel free to check out our game and see if there are any features you'd like to adapt and add to yours. If so, send me a message and I'd be happy to share tips, code, etc. :)