I just tested it on JoiPlay in both English and other languages, and the bug did not occur with the first opponent. Please try reinstalling the game, and if it still doesn't work, send me a message again
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I apologize for writing after such a long time, but I tried what you wrote to me. I installed the game in Joyplay, clicked the plus sign, and selected the import archive file function. I waited for it to import over 4,000 files and started the game. Everything worked until I encountered the first opponent (after receiving the knife and drone), and suddenly I got an "opacity" error, and I don't know if I did something wrong. I have the latest version of joiplay 1-21-0000-patreon.