Thanks for playing the game. I will be honest with you, I intended to add pause, and option, with bosses for each stage, but I had some technical issue since I'm quite new to Godot engine. There were some cases with FPS drop, and had to search around to solve that So, I had to focus on level design on last days before deadline, since it's the core gameplay.
1- I see, that was a bad game design decision from my side, it was boring when I was testing it, but i thought that will properly be a good thing to convey that "hard" mode is unforgiving. That was too much. I took note of that.
2- Originally, there was no stamina bar, but then the game was" broken", that you can spam dash. But, point is taken will make sure to adjust the Stamina recovery rate, perhaps let it gain even when on air too will be good.
3- I was planning to add gates, but then I thought you are a ninja, you can just move on and avoid what you want. So, combat became non mandatory.
4- Nice idea! Thanks for that. I missed this point.
Not all, I really appreciate the feedback. Thanks for taking the time.