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ごちうさアラーム～チノ編～?
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There's also a Chino version available, if that's your thing.
I think that's just a region lock—I get the same message even though my phone meets the Android 4.4+ requirement. You can find an "unrestricted" download in the usual feline-themed place, although apparently it requires a helper app and a rooted phone to function properly. To get it the legit way, I think you have to use a VPN so that Google thinks you're in Japan (here's an example guide, although I can't personally vouch for the safety of that particular VPN app).
EDIT: While I can't say for certain that a region block is to blame, I can say that the GochiUsa alarm apps are available, at least for me in the United States. Might have to spring for one...well, here's the links:
Ever tried sleeping earlier? I also recommend this unique alarm app. https://play.google.com/store/apps/details?id=jp.co.gamegate.gochiusa.chino