What are these tiny bugs that appeared on our Casio keyboard?

Yesterday my son noticed these bugs on our keyboard. There were dozens in total. The pictures were the biggest ones. They were maybe the size of a ballpoint pen ball in total diameter (much flatter, obviously).

I assumed they were spiders. Wiped them up. And dumped them in the garbage outside.

Then I noticed dozens more, much smaller, still, along the piano.

I those up, too, this time with rubbing alcohol hoping pick them up and even kill them off.

But now I’m worried they were seed ticks?? Yuck.

Anyway. Anyone know for sure? This is in Wisconsin.

I have a couple more pics, but they aren’t much better. I should have taken a video…