about number 2 and 3:
2) Stamina system is pretty bothersome, I'd like to suggest more Invincible Frames for most of the Bosses, since as you said, the cursed sword just melt them all. Or just reducing the attack speed of that weapon.
3) The main reason according to the Dev about Nene laying eggs instead of an actual baby, is to avoid problems with platforms like Steam due to the inclusion of actual children in the game.
I see what you mean about number 3. However, a stamina system wouldn't be that difficult. I've made something like that when I was programming a modded Spigot server for Minecraft. All you have to do is keep track of what the player does and adjust the stamina accordingly.
I suppose if he doesn't want to do that though, it's his choice. I just think it would be interesting.
Making a game more difficult/frustrating by adding more ability restrictions like a stamina meter, doesn't make it more fun. The complete opposite, actually.
Most people play games to escape pointless obstacles and just enjoy a fantasy scape instead. If you need a challenge to produce endorphines, stick with reality. Real life is a horror show - you'll love it.
