Really clever concept and flawlessly executed. If I could give critique it would be two things, the first thing is actually really small and you probably did it for design purposes, but the hurtbox of the enemy is really huge and it doesn't seem like you killed it when you shoot it. Another thing I could criticize is the artstyle, it may be my taste or the fact that I'm colorblind but I didn't really like the colors that were chosen for this game, they kinda blended together for me, and for the characters I think you tried to stuff too much detail in too few pixels by making it look noisy and unclear. Still it's way more than acceptable, I'm not an artist so take my words with a grain of salt, and the main game idea and the design are excellent and really fun :)