The game is on good shape, congratulations. But I want to make some suggestions:

1.- Tinker march of the machines lowers fps way too much. Maybe you should consider removing it. (I'm on a high end setup btw)

2.- Bring back the feature in picking phase where if the player forgets to pick a hero when the countdown ends, instead of picking a random hero from all available, it picks a hero from the most picked hero pool by the player. Sometimes people forgets to pick their hero and then abandon the game from the start when the game picks it for them.