Hello!
- Yes, the player should have 3 lives.
- You can either have a restart screen or just have it close.
- windowed is preferable, but you can have it be full screen if you want to. (I recommend a key like F5 to switch between them in case someone has trouble running it in full screen.)
-Yes, you can add a pause button. key should be P. (I recommend adding a 3 seconds countdown after you unpause.)