Boktai stands apart to this day for making use of solar energy.
First though,the full Kojima quote.
“It was met with fierce opposition from the staff and even within the company.

In that sense, ‘OD’ is just as different.”
Unlike Boktai, these devices ran entirely on sunlight.
I find stuff like that endlessly appealing.

But they are, at least, a chance to pick at our assumptions about videogame development and design.
What do you reckon?
This being a post about Boktai, here’s an obligatory shout-out to fan-made spiritual sequelKura5.
