there is a bug in lvl 12 (the one with the island in the middle): when you use an saphire on a tower at the entrance and it freezes a monster, any monsters behind stay behind, the pet doesn't move any more and when the boss is dead, nothing happens.
Okay, I have tried to play this game for three days now and it just wont start. Different browsers, refreshing, turning off all spyware etc. did not help. So unfortunately I can only give this one star and hope, that the problems will be fixed and I can play this game in the future (cause I love DotA and LoL)...