I believe also that Unity 5 is the version with the best OUYA support. I don't believe Unity 2019 works so well with it, if at all.
Viewing post in Hopefully not a dumb question
Thank you guys so much. I'm on board and joined after ProHiScore's helpful answer
I took a look at the information provided and installed 5.4.1 and followed one of ToasterKidd's ouya.world post and set it being landscaped left and minimum api to 16. I will finish it the apk the best I can and will definitely need help finishing it up and some play testing help as well.
Glad you found my post helpful. Don't forget to follow these, too:
https://ouya.world/t/unity-inputmanager-ouya-config/94
https://ouya.world/t/unity-setting-up-the-androidmanifest-xml-for-discover-store/143