Routing Game

This is an old game I've made in SFML.

The goal of the game is to rotate the tiles to make all of them power on.
The title displays the current seed and how many tiles are active and how many are there in total.
The resulting graph should be a tree so there should be no cycles at all.

The controls are:
F1, F2, F3, F4, F5 - start a new game with varying difficulty (board size).
Mouse Left Click - rotate tile under cursor.
WSAD - move the camera around.
Space - randomize all tile rotations (but not start a new game).

Go here for the code: https://github.com/FRex/routing-game
And here for the original thread: https://en.sfml-dev.org/forums/index.php?topic=20228.0
Source is also included in the src dir.
The game needs no libs except graphics, window and system from SFML and loads and writes no files at all.

It's based on (or a clone) of an old freeware game I had back on Windows 98 that I can't remember the name of anymore.
If someone knows and tells me I'd appreciate that.