Fixed a bug where blocks remained after undoing

Thanks to tdhr\'s (that\'s me) hard work, the undo feature has finally been added!

However, due to my limited programming skills, bugs may occur.

If that happens, I\'d appreciate it if you could let me know!

A save function has been added.

In addition to the existing auto-save feature, you can now save your progress at three additional points of your choosing.

During gameplay, press the Enter key to open the menu.\n\nFrom the menu, you can select Return to Start or Exit Game.\n*In conjunction with this, the R key retry function has been removed.

In the latest version, you can reset your position to the starting point at the beginning of the game by holding down the R key for 5 seconds.

Please use this when you are stuck and unable to move.

There are several bugs in this game that prevent progress, but we have made emergency fixes for those that were easily detected. (take 2)

If you started with a build ID number smaller than 19612284, please restart from the beginning just to be safe. We apologize for the inconvenience and thank you for your understanding.

In addition, we have made the New Game button on the title screen easier to understand.

There are several bugs in this game that prevent progress, but we have made emergency fixes for those that were easily detected.\n\nIf you started with a build ID number smaller than 19602607, please restart from the beginning just to be safe.\nWe apologize for the inconvenience and thank you for your understanding.