Awesome game! I had lots of fun playing, and it was satiisfying watching my little frog dude play out the level.
As others have mentioned, it would have made quite a difference to the user experience to be able to move the icons instead of deleting and placing a new one. One other thing that would have been nice (in my opinion) would be able to navigate the map with the mouse (middle mouse button maybe?), because then you don't need the keyboard at all.
Anyway, awesome job!