There are a few things I want to say about the game after analyzing it longer.
1. I think the swimming mechanics needs some work. She swims like a guppy, darting in straight lines rapidly. Perhaps look at a game like Super Mario World for some insight on how the swim should work.
2. Cynthia has a vulnerability that makes her too easy to defeat. If you use the red sword against her, you can spam her really fast when really close and drain her HP way faster than you should be able to. Perhaps make a stamina system on the main character that can prevent this. Maybe make a level system where you can level up to increase stamina, HP, attack, defense, etc...
3. In regards to the pregnancy, is there any reason why you have the main character trade an egg for a "Magic Puppet"? I think it would be more appealing to just be more direct about it and say it's the Nene's kid and give her traits similar to the parents (instead of generating random traits).
4. Perhaps give more variety to items. What I mean by that is instead of generating random status effects on items, make different sets of items that pertain to certain groups of abilities (or a single ability). For example, erectshroom maybe gives attack, and balls shroom defense (or however you want to categorize it).
5. I don't know if it was intended, but infinite arrows is very overpowered.
Other than that I really do think this game already has a good base built. I think it has a lot of potential and I look forward to seeing where this will go.