The advice by ShadowHaven here is a good start. Since Str8 isn't an official app from the app store, you'll have to do the "install from unknown source" thing. Also, if the game does start and you get a black screen, give it a few to load. Depending on the age of your device, it can take longer to load on older models. The newest version of the game (currently on Patreon) has a splash screen notifying people of that but that was only added on the most recent one. Hopefully the unknown source thing is what's holding you up, though. Try that and let me know.
Another option could be to join our Discord if you have it. that's real-time talking and we may be able to help. we also have several other android users on there that usually drop tips or help people out