I was able to figure out pretty quickly that I was a firefighting robot on a spaceship, and what I needed to do. The mouse/camera control was a bit frustrating in my browser, I felt like I could only operate the mouse in the top 10% of the screen, and the bottom half was just wasted visual space: the camera could probably move up a lot to give us a traditional 3rd person perspective. It could be nice to have better feedback on the extinguisher/fire vents - the black smoke is kinda working, but having a more tangible flash, progress bar, sound effect, or anything could help reinforce "it's working, keep going!"
I didn't get too many chances to use the welding action, I might have played more if the camera wasn't so frustrating to use. The player fantasy and setting were very clear!
Here's a playtest