v1.0.1 has been released!
It includes the following fixes
Previously, the restart operation was only available from the menu screen.
Starting with v1.0.1, you can now immediately restart by pressing the button in the upper right corner of the game screen or by pressing the designated key/button, just like Undo!
In 5-7, a bug was found in which blocks would overlap or buttons would be judged incorrectly in certain conditions.
This problem has been resolved in v1.0.1.