Thanks for your feedback
There is a healt display on the top left but it's a bit buggy in the WebGL version. In the WebGL version the health display is only visible while you are in full screen mode. I don't know how to fix that.
The thing with being only able to only shoot one melon at once was also in my head but I kinda forgot to implement it.
and I like the idea of needing to pick the melon up again.