Do you need to move the finger to increase the value? It's doesn't seem a great IX, and it also has low discoverability. I would offer a single tap for the default value, and long pressing for zapping more, with a logarithmic increase. Like stacker.news

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I think it's actually a great UX *BECAUSE* you need to move the finger; it's very appealing :D single-tap has a default value, long press shows a dialog where you manually set the amount we'll see, it's an experiment :D