There's a new bugfix release ready:
You can download it here: Windows (64Bit)How to install: Unzip content to an empty folder and run MazebertTD.exe. Make sure to unpack the directory to a location with write access (not program files).
Thanks Takatschun for playing the first coop game with me last night :-)
We made it till round 63 until the simulation crashed. This one is fixed now, excited to see how far we'll make it next time.