I very much like these types of games (simple rules, arcade controls, puzzle), so I enjoyed this quite a bit. My patience wore out in my 3rd attempt at the hardest mode, so unfortunately I'm not very 凄い. Introducing the multiple layers earlier would've probably been good since it's a bit of a jump in difficulty.
Very good execution and scope. Also, I like the extra doofy gopher. :]
Edit: Also, a minimap or zoom feature would help a lot! Alternatively, I could improve my short-term memory :p