Thanks for your feedback, could you elaborate a little? Do you mean visual feedback effects? Like I did with the pointer but more present?
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I mean like when you hover over a falling rain drop, it could react visually in some way so that you know it's interactive. Wiggle, change in size, change in opacity, that sort of thing. Similarly, when you click on the drop, it could have some sort of reaction like some splash particles, sfx, a ping, that sort of thing. Hope that makes sense :)