Basically a puzzle board yeah. On some future levels that larger square area will be filled with the smaller squares hence the larger size allowance for it.
Other element details:
Top of screen: level name and (eventually) score in the W: area.
Top right: Target pane for that level, for max of 6 targets and 1 boss.
Top left: battery power and player (battery is also represented by time).
Top center: Current target, life bar below.
Center: puzzle board
Bottom: shield and time bars. (the shield bar is on the top left in the first image)
Other element details:
Top of screen: level name and (eventually) score in the W: area.
Top right: Target pane for that level, for max of 6 targets and 1 boss.
Top left: battery power and player (battery is also represented by time).
Top center: Current target, life bar below.
Center: puzzle board
Bottom: shield and time bars. (the shield bar is on the top left in the first image)