Plain graphics are the main thing. The pumpkin pieces slide all over the place and i found the physics can be wonky at times.
You click and drag, then move pieces around until they fit.
The puzzle is all about trial and error. There are no stated timer, hints, toggles, modes, levels, or difficulty settings.
Most of the time starting from the edges and corners first is better. This uses the stated drag-and-drop action.
Q1 Controls: A: Click and drag.
Q2 Objective: A: Fit the pieces together.
Q3 Stated features: A: Not stated.
Q4 Main mechanic: A: Drag and drop pieces.