Thank you :). I'm glad you liked it. The Controls are listed in the Help section of the menu. Do you mean replaying the level when you've already finished it? You can do the level selection after finishing it or like you mentioned through the main menu.
Linux or Windows? You can select Pipes/broken Pipes with [1] and [2] and place them with with the left mouse button. The controls are listen in the help section in the menu
