[x] knocking back to start
[x] star second rolls
[x] star protection
[x] 0 passing
[x] scoring on final position
[x] no overlap
[x] pass on no-moves available
[x] only pass turn on "legal" move
[x] windows build
[x] add useful logging
[ ] detect "win"
[ ] add splash / start screen?
[ ] 1p / 2p modes?