My game also broke pretty badly (spawning logic was spawning all enemies at (0,0), so I had to replace it with random spawning) several hours before submission, so I understand. If you aren't already using Version Control, it's important to learn especially for these situations when you need to rollback to a good state.
The infection animation is suitably uncomfortable.
The tileset could use some work to greatly help the feeling of being in an ant tunnel as opposed to a underground dungeon. e.g. rounded corners and the replacement of the broken/collapsed wall tiles