I am primarily a digital game designer so I do not feel qualified to comment on the production of a physical game. However, I do think you have a disconnect between your theme about acid rain and your planned gameplay. The focus seems to be centered around a card battle system with the players fighting against monsters. I'm not seeing how your research on acid rain fits in at the moment. I recommend expanding on this aspect of your game. That said, you have an unique art style which works will with the narrative you have described. I look forward to seeing the different monster and character designs.

I really like the aesthetics and ambitious scope of the game, but I wasn't able to get a very good idea of the gameplay, or how it relates to the themes (especially in terms of elements like relatably expressing the causes of acid rain) on a moment-to-moment level. The overall meta structure of the game is thematically solid, I just wish I had a better idea of the experience from turn to turn. Right now it strikes me as almost reminiscent of Dokapon Kingdom, which could create an interesting aesthetic to go with the theme - players feeling personally cheated or personally culpable for climate crises.