Awesome that it's random gen! I love the pixel art, the colours are chosen well, enemies, walls and background are easy to distinguish and it pleases my eyes. Particle effects look cool! Aiming is a bit glitchy.
Yeah I tried to keep the art simple, I think it's the first time I use zero external sprites for a game haha. Sorry about the aiming, the input system in Unity changed a while back and I'm still figuring it out.
