Done

Game environment

Game should support both fullscreen and windowed graphics mode. Allow "Ctrl+Enter" shortcut to toggle between them.
Starting music volume is slightly too loud.

Add a scene for main menu, which shall be the default on launch
Move map creation feature into a separate mode "Map Creator"

All scenes
Add a button to bring-up the dialog box, which is now brought up with Escape key. Preserve functionality of the Escape key.

Enable adding an arbitrary number of units to the map.
Move "Tree", "Rock" and "Wall", "Delete" buttons to a toolbox. Let the toolbox have a title, e.g. Obstacles
When spawning an obstacle onto the map, the desired behaviour is so that it happens on MouseUp, not MouseDown
Add a number with scale, e.g. 1/10 to the "Map size X" and "Map size Y" sliders
Change text on "Rozmiar {X,Y} siatki" to a more elegant, e.g. "{Szerokość ,Wysokość} mapy taktycznej"

Text in "Controls" is not descriptive enough
If you save a game under name ".", it can't be loaded. It should be impossible to save a file with this name.
Provide description for what "default", "manual" and "auto" modes do. Enable choosing them just after launch

Simulator
Implement 2 actions per round limitation

If you click buttons in order: "Nowy gracz", then "Nowy wróg", then "Losowa Pozycja", or "Nowy gracz", "Losowa Pozycja", or "Nowy wróg","Losowa Pozycja" the behaviour is incorrect.
If you select a character for "Move" or "Run" or "Charge" action, emphasize visually (highlight, change colour) the path that will be taken by the character

Camera view can be zoomed-in and zoomed-out by scrolling middle mouse button
Camera view can be moved by arrows keys or hold middle mouse button
You can undo last action or double action by pressing "Cofnij akcję" button. For now it doesn't decrease character PS.

Holding down the left mouse button you can create or removing multiple obstacles at once by moving the cursor over the map