New power up: +50 coins when a tile is explored.
New tower: Tar
Tar tower has low AoE damage, but two effects which slow down enemies and add fire weakness to them.
Sound system improvements
* Sounds added to menu buttons.
* Fixed cases where sounds would stop playing when many of them were triggered consecutivelly.
Game balance adjustments
First 10 tile rounds rebalanced. Some enemies have less health and give more rewards.