Quite a nice game. I'd like to suggest an improvement for more championship feeling: give each player a number of points, depending on their rank on the race, and display the current rankings after each race.
Still good, but I didn't enjoy it as much as the first one... Because of some remaining glitches, like the fact that sometimes the border prevents us from doing the move we want.
Very interesting game. This is not another defense game, this is a game which really exploits its theme, and has a pretty original gameplay. Still has a few minor defects, though: it can be very slow when there are hordes of zombies on the map... 5/5 anyway.
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Hopefully someday the Linux version of Unity will appear.