Just the other day, Just Shapes and Beats updated with the 'Just Shovels and Knights Mixtape' DLC, which gives you some Shovel Knight tunes to play for free. Turns out there's more to the collaboration than that though, as Yacht Club has confirmed that the Shovel Knight amiibo now works with Just Shapes and Beats.
You can now use the Shovel Knight amiibo in Just Shapes & Beats! Give it a look if you haven’t yet. As for more games… please look forward to future announcements.
With one answer from Yacht Club, we now have two more questions. What does the Shovel Knight amiibo do in Just Shapes and Beats? The company didn't offer up any information. What other games will the Shovel Knight amiibo work with? That remains a secret for the time being as well.
UPDATE - We have info on what the amiibo do, thanks to Kolma.
There are 4 shovel knight songs now in Just Shapes and Beats, and each of the 4 characters can unlock a song. You can either unlock them normally or use the amiibo to unlock them instantly. You can also scan any amiibo to get a certain number of beats a day.