Technically yes, but you can continue playing it as many times as you want to see missed secrets or go for a more in-depth look at each thing in the game. Try your best to break the game even! It just means I'll have more bugs to stomp out for the future so this game will be as polished as I can make it.

Once you speak with each NPC and explore the maps that is the "Test" ending, you did mostly the bare minimum and learned a bit about the future progress.

Once you do the "Test" ending, read all lore pages and find the "Mysterious Book" Key item then read it that is the "Lore" ending, you got a grasp of my future progress and most of the lore lurking around.