Thanks for your feedback - please use the bug report form here. Whip fern not disappearing is definitely a bug and I'll look into that, but I might forget and that's why I like people to submit bugs.
- You can only craft one shield per day, so if you've already crafted the mighty shield you can't make the epic shield. it should default to crafting the best shield possible, if that's not working I can take a look
- Stamina is one example of me trying to make rpgmaker do things it doesn't naturally want to do, so it's a little janky in places and I'm trying to fix that without breaking the whole thing. What's supposed to happen is that you use stamina while fighting and then it regenerates like health by walking around or at the end of combat turns. Eating breakfast does increase your max stamina for the day, but it might take a minute for that to update correctly. I'm split on using stamina out of combat - it's thematically appropriate, but might not make for the most fun gameplay. Still in work in progress, and thanks for your thoughts!