Set the number of particles to use (I recommend 60 to begin with,) and then click the play button. (I just made it that when you click the purple button, it shows the options) Press the U key to show settings. For instance, you can turn the water into slime! You can also click and drag the fluid. For most enjoyment, play it on TurboWarp with lots of particles (up to 600): https://turbowarp.org/1084952266?hqpen&fps=60