Hello! In today's update, I would like to apologize for a very unpleasant bug. I'm really sorry that it happened and that players who tried to unlock the achievement for completing hardcore mode did not receive the achievement. It's a terrible bug and a horrible feeling when you play through the game, try your best, think you're doing everything right, and still don't get the reward. I'm truly sorry that I missed such a bug. How did it happen?
When I was testing the game, I checked the achievement trigger through the final scene, but it turns out that in one of the scenes before that, the progress was being reset. That's the whole secret of the problem. The game has many different scenes, and each has its own files. I'm a solo developer, and so the bigger the game gets, the more different mistakes I can make. I'm very sorry, but it's just part of development. I'll try to be even more careful in the future and not miss errors like this. Still, if they do occur, please report them — then I can fix them faster. Once again, I'm sorry that this happened. I really hope everything is fixed this time, but if the error recurs, please let me know. Thank you for your understanding!
Also, today's update added the ability to change the screen resolution, a VSYNC toggle button, and a sound slider (volume can also be adjusted in the main game scene).
Sorry again and thank you for your support!