Sushicat-Sensei tell me that size matter. Sushicat-Sensei very wise sensei and very big sensei. Sensei also tell me that disciprine come from full belly.
Here are some things you might want to improve:
# Let the civvies recompute their path every time they leave a building. If this is eating too much ressources, you can either decrease the frequency they scan for active Zombies (since only the crowding Zombies actually pose a threat, thus it's sufficient for them to only scan while the clock's empty) or only let them recompute when rubble or boards have been moved.
# When abandoning a Workshop, the Civvies stop dead for some time while looking for the next one. This gets heavier when several connected Workshops are abandoned after one another. Please improve this (possibly by giving them an all-time-route through the Workshops on the map, decreasing their right-on computing time when a Workshop crashes).
# When browsing through the user-generated maps, a rating function would be awesome. Just something like 1-5 stars, possibly at the end of a map or below the timer box (getting updated when the player leaves the game).
You should not only add a game menu (for pausing and quitting), but also an immediate exit-option for the hacking interface. Since the generators are up only 60 seconds, the player loses valuable time while the terminal is still typing. The feel of the game is really neat.
I absolutely love the art style, but this game is incredibly hard for me. I have to play every single sequence for at least three times and some a huge lot more often.
The "respawn only after you've reached the next safepoint" is not helping, exactly like the slow decrease in height.
But, well, the art and style of this game kinda make up for that.
You definitely have to make the music loop. If you want to improve the game even more, add a score saving ability or let it calculate points out of the time (with an increasing multiplier) so players can compare something. Last thing besides visual effects would be to add bonuses, extras, events; just something that keeps players to the game.