The Android version here on itch is a demo, and has certain functionality disabled (character management is one of them; the Gallery is also disabled, and there are also four arenas that aren't included). I'm also not planning to offer any updates for it.
The full Android game is available exclusively to Supporters on Patreon, and is constantly updated with new capabilities and animations. The purpose of the demo is mainly to be able to test the game and see if it works ok on your device.
There's a link at the top of this page, under CURRENT VERSIONS. You can also reach it from inside the game, from the main menu, if you tap on the Patreon logo.
I'm pretty sure Patreon accepts Visa and all major credit cards (it's them who handle payments).
If you haven't used Patreon before, be advised that what you're paying for is a monthly subscription. That gives you access to download all the new game releases for as long as the subscription is active (the releases themselves will never expire if you download them). If that's what you want then good, but if you only intend to get the current version make sure to cancel your subscription before a month runs out (you still retain access to download all new builds for the full month, even if you cancel immediately)
