I'm sorry to do it.
There is currently a bug in the SAVE button.
In addition, the work involved in the upgrade of UNITY has broken the project, and it is no longer possible to deal with it.
Unfortunately, there is no prospect of recovery ...
Sorry, please play with the following method.
・ Do not use coins until you have collected all items except the item in the upper right of the item column.
・ After using coins, do not save until you get the item at the top right of the item column.

Bug details
If you use two or more coins and continue after SAVE, the gimmick will be in a state where only one coin is used.
At this time, the coins in the item column have already been used, so you will not be able to clear the game.

I'm sorry that I can no longer deal with the bug.