Darkamcha i just got the hard badge, to get it you must have all areas under control, that means tower and factory at level 3 and danger level put on 0%, if done correcly a green fist will show where the danger level was. Don't worry about the outside areas.
Default controls are kinda unplayable, then i changed the lower row to iop and despite some mess up with my coordination i was hitting more than 90% on easy songs. My first atempt at this game was frustrating as i looked at that editor thing and though "wtf do i do with this?", then after finaly starting playing i can see this game has a lot of content and is excelent to play.
151 days to finish on seriously hard, had to do it on new colony, the trick seems to be to do zombie control often and try to get that danger number at the post as low as possible.
4/5, mute button: just a hicup, menu button not asking: this is a problem but only if you misclick, not saving: another issue, maybe add a password system for each level, give a code based on user id so people don't cheat. Overall nice puzzle game.