I'm not sure if you managed to get passed the furnace level, and apologizes for not implementing ui to update or display objects. At the Ventilation room, your objective is to simply clean all the vents, and once all red lights dissappear, you're free to go to the next level.
Our way of direction was to listen to the AI at most of the parts, so to have sound on may have been more helpful. We'll keep that in consideration for future game jams. Your feedback means a lot to us.
There are bugs. The first time I tried to play the game I couldn't get past the first room because the door switch wouldn't activate. The text didn't pop up saying "door switch" and I couldn't push it. The second time I tried I managed to get to the ventilation room but had the same problem as @solid_chabisto - there's nothing to interact with.
I got stuck for a minute there... I didn't know I had to drag the vents open. Up until that point everything involved pressing "E" to open... and my weapon being "fists" wasn't enough of a clue (clicking on the vents didn't do anything)
If a little hand indicator appeared over the vent when I clicked, or when I moused over it, then that might have been enough of a clue to figure it out immediately. I think that would have been more helpful than the narration being more descriptive, just a little bit of visual feedback to steer players towards the correct interaction.
The vents did feel nice to open after I figured it out.
