Popcorns Time has a simple mechanic. You click to drop kernels into a container and must stop before any spill happens.
You click to drop kernels, you must fill the container without spilling any.
No extra buttons or toggles are stated.
Timing your clicks is better then rushing. You have three attempts to fill the container, and you must stop before a spill happens.
Q: What are the controls? A: Click to drop kernels.
Q: What is the objective? A: Fill the container to the top.
Q: Are there any stated features? A: Not stated.
Q: What is the main mechanic? A: Drop kernels and stop before a spill.