Here you can watch the new Launch Trailer and get the game:
http://store.steampowered.com/app/674750/Yet_Another_Zombie_Defense_HD/
We really believe that you're going to enjoy the remastered version on Yet Another Zombie Defense! If you encounter any bugs or have any ideas for improvements, please report them on the game's Community Discussions section:
http://steamcommunity.com/app/674750/discussions
Steam Trading Cards are already done and will be added as soon as the game is marked as elligible by Valve. We also plan to launch Steam Workshop in the next week and we'll be fixing any bugs as soon as possible.
Note: Everyone who owns the non-HD version should have received a 75% off coupon. If you own the old version and haven't received the discount coupon, please try logging out from Steam and logging in again.