Really enjoyed playing this once I got the hang of it.
Simple concepts are often the best and this is a great example.
Things for your consideration:
-The static helicopter image might have been better with an animation but I did get laugh out of it being the way it is.
-The monotone nature of the cave colour gets a bit repetitive and could do with some variation to keep the player engaged.
-Faster restarts
-Music and/or sound effects