It depends on a few factors, but in general yes. The issue is how it gets on the system. Nintendo is staunchly against emulation and has also gone after people who bypass their game systems security. They have a rabid pack of lawyers and the company is more than willing to use them.
+1 for the anti-consumer statement.
This is a company that goes after groups who hold tournaments with their games and issues takedowns against people on video platforms just playing their games. Genuinely an awful company (good games don’t excuse the behavior.)
Illegal to develop for? No.
Illegal to bypass security mechanisms? Gray area. Courts typically side against the hackers, historically.
Illegal to display trademarked material? Yes.
The NES has defeatable copy protection which led to a decent dev scene that could ‘legally’ publish games. The game boys copy protection is interesting in how they approached it:
https://piped.video/watch?v=ix5yZm4fwFQ
Basically the catch is you either have a hacked cart or display Nintendo’s logo … so they can go after you either way.
Nintendo has a horrible history of shitting on its fans and projects such as these. In all probability the modders are actually inadvertently (I haven’t checked) falling into Nintendo’s trademark trap on the Gameboy. The Nintendo logo it shows at the start is a check that enables the boot of the game… and is an asset that must be present on each cart. That means if the logo is displayed… they can sue for trademark infringement. If not then they are exploiting the hardware- and we know what happens from there, unfortunately.
This is a cool project and I hope it does well but Nintendo is a shit company that doesn’t deserve the fanfare they are given.
*Ominous rumblings of the horde of Nintendo lawyers being summoned.*
Nintendo cease and desist (or worse) in 5… 4… 3…
So there is a calculation for what time the sun is at a particular angle in the sky which will be relative to your area and factors in the time of year etc. You could use that as it will give you a very specific to your area mathematical answer to when you should close your shades. This is a good start. If you mix that with a light sensor and set minimums that will get you the rest of the way there (no sense run blocking lightning a cloudy day.) You can just use a light sensor but it will be more erratic if you don’t correct for weather and seasonal light levels.
The rest is personal to how sensitive to light changes and seasonal settings you apply to it.
As far as the physical control goes - there are several commercial devices available as well as diy solutions involving motors and 3d printing on YouTube.