First of all, I'm deeply moved by your thoughtful and considerate approach. Thank you so much. The intro was inspired by Zhuangzi's "Butterfly Dream" (胡蝶之夢). I wanted to give the feeling of something starting in a disjointed way, like the contents of a dream, so I directed it that way. It actually doubles as a hint for how to think about strategy. The intent was that you'd read it and then act, but I didn't block players from acting before reading either.
The reason I implemented the size system was to create a difference between the front and back layers, to solve the problem of units overlapping and becoming hard to see. But it didn't really work. In real life, things in front are larger and things behind are smaller, but I realized too late that I should have done it the opposite way for clarity.
And I'm sorry for the confusion. The size system doesn't affect HP or damage at all. It came purely from thinking about how things should appear to the player visually. I considered adding new sprites for the back layer, but I didn't have the energy left for that, so I reused the same images.
Thanks to your thoughtful consideration, I can feel my cold and empty heart, drained of energy, being filled again. Thank you so much for the careful feedback.