Don't sweat it being your first game, the quality is top-notch, honestly even better than developers who've been at this for a while. That said, I'd be lying if I said I liked having constant death as the main mechanic; it feels like the girls forget what just happened. Still, I think you've got a killer idea you could really lean into: the main character getting flattened like a cartoon trope. Sure, it’s goofy, but it justifies why he wouldn't actually die (succubus's magic doing), but the girls have to "inflate" him back up, or he just has to wait to pop back into shape as a penalty (maybe that's how the succubus wanted it). Sounds silly, but I think it could work. Either way, it's your game, so don't let me or anyone else boss you around. At the end of the day, gamedev should be fun, and that only happens when you're making what you want to make, not what others tell you to.