Hey Richie!
Sorry to hear you're experiencing issues getting the game up and running. This might be due to a faulty .rpa download.
I'd recommend grabbing from our Patreon (we have a few mirror downloads to choose from) as the servers on Itch can be a bit hit or miss.
Here's a link to the latest free version 0.8.12:
You'll need a Patreon account, but its free to create if you don't have one already.
We also have a guide here for installing on Android in case you need a reference: https://rift.ink/3PADL3p
Hope this helps!