ver 1.0.C I have confirmed that I can run the game from the Steam library on my MacBook.
There is a warning that the game cannot be run on 32-bit OS, but it can.

We also fixed a bug where it would freeze on retry in one place.

The current pricing defaults to the currency rate of about 2 years ago.
Therefore, it will be corrected to the most recent currency rate. (I think it will take about 3 days to reflect the change.)
The current rate is 149.5 yen to the dollar, but the Steam price seems to apply 116 yen to the dollar!