Now on Mac
New look: art and icon, a new font that shows Turkish, Russian, Japanese and Chinese properly, new menus and end screens, a tower that cracks as it takes hits, every upgrade visible, holiday looks.
New sounds: your own sound set, lots of new sounds, music that keeps playing between menus and loops.
Achievements: 35 Steam achievements and an in-game Achievements screen.
New bosses and enemies: a different boss every 5 waves, a soldier family per boss, flyers from wave 6, a wider camera in boss fights.
Upgrades: the third upgrade in every category, most of them a choice of two.
Co-op: two towers, faster push waves, a shorter stun, both names on the leaderboard, pause from the upgrade screen.
Online: about 89% less bandwidth, guest pause controls, a new leaderboard screen, anti-cheat.
Balance: gentler difficulty, a smoother boss curve, new wave pacing, half a second of hit protection.
Bug fixes: slow waves after 10, trees covering enemies, accidental leaderboard opening, and more.