Phone does not meet min requirements...but I had the app before!

[InkyPaws]

So I stupidly deleted some games, and went to reinstall them. One of them (Little Acorns) is now saying my phone does not meet the minimum requirements. I've got no idea why. It's not visible on my phone through the store so I did a manual download onto my SD card, and it says it's unavailable.

Any ideas?

 

[QuadraFX]

The app developer prepared an app update in the meantime and requirements changed, too. And You haven't updated the app, so this is the result. It happened to me before with other app.