If this was a demo, I would definitely pay for a full game. The pixel art was really good, it controlled well, and I really liked the customization. If I was to give suggestions for how to add to it, I would suggest new enemies with different sex animations, more levels, a few more abilities to deal with the new enemies, and maybe a character selection/customizable hair, eyes, body, and overwear. Also, you could add a few more endings depending on who you lose to, amongst other things(Like running out of time).
P.S. You could also have a shop where you could buy said abilities and additional character customization.