Things I liked:
I've seen several games very similar to this one, but what stands out here is the mechanic of jettisoning passengers. It's a brilliant way to spice things up, and it creates a great risk-reward system of figuring out exactly how many people to jettison in order to be able to stabilize without tanking your score. The pixel art presentation is nice, and I particularly like the animation of the passengers flying out of the airlock. Although it wasn't particularly noticeable during gameplay, your comments have pointed out that you have an extremely intelligent difficulty scaling system. The duct tape was a neat touch as well.
Potential areas for improvement:
One of my main problems with these kinds of games is that I seem to always run into a problem Mark Brown calls "optimizing the fun out of a game." In this case, I ended up just running around with a wrench to fix the pipes because everything else I could keep under control, which meant that I didn't end up engaging with your more unique and interesting mechanics. Specifically, I think making the jettison button easier to reach might help make it a more used tool, along with possibly allowing you to use duct tape while holding a tool (or even buffing the time the machine stays off). Having said that, you've already talked some about changing the tools to fix the pipes, which probably would also work-- maybe you can use that as another way to help scale the difficulty?
Overall:
This game is an original take on a classic game jam concept, with several features that make it stand out. I'm glad to see that you're still working on it, because I think with a little more balanced mechanics it will be much easier to interact with the elements that make this game unique. I'm excited to see how everything improves!