Thanks, these are useful specifics. You're right about the version mismatch: the current downloadable beta is 0.6.20. Update: the topic now shows 0.6.20 too; thanks for catching that mismatch.
The current controls already use floating origins where each thumb touches the lower part of the screen, rather than fixed sticks. The question to test is whether that still feels comfortable near the screen edges. Your ground-zone plus wind-up suggestion is also going into the phone-readability test list; I won't treat the timing as validated without people playing it.
Thanks for making clear these are impressions from the page/thread. If you later try the APK, please mention the version and one room or attack that felt unclear. We're gathering voluntary feedback, without a test-swap requirement.