Hmm, I love the wave system, but what if we could move through different areas, with different enemies, traps and obstacles, som like The Binding of Isaac? I feel as if that would make the game more entertaining.
Also, I noticed that you made animated sprites for the struggle scenes, but we can't really see them because of the drawings that appear, so what if they were moved into a different part of the screen?
Nice game btw! It's a lot of fun and not just because it's a porn game lol, Def has a lot of potential.
Edit: Also, the 'fov' is too small, maybe it's just personal, but I feel as if increasing our visual range would improve the gameplay a little, just because of how annoying some enemies can get at times.