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Have you checked if it's a memory issue?

If you mean the visualizer, there is a difference in sensitivity on Android and iOS. If you mean the tempo, try adjusting the BPM slider. See manual in screenshots.

See screenshots. Make sure your phone ins't muted.

Yes. The app will save patterns, drum mixer levels and the synth and sample volume.

The new version of Kontrol is called Pocket Punk. It's also available on Google Play making it easier to receive automatic updates. The new version will go through updates and hopefully grow into a more developed product over time. Let me know how your installation goes.

Currently, there is no save option. But if you don't close the app it should remain where you last left it.