I'm no big brain dev, but thought after running so much, I'd take a rest and give you some feedback!
The tutorial and voice over were really nice! The gameplay loop is also really interesting. The idea of collecting points, going for a highscore, reminded me of fond memories I had with games like Jetpack Joyride.
The sound work fits the game perfectly! Both the sound effects and music feel satisfying to listen to. Also, really cool effect to be able to see the character through walls! It's a nice but really important touch!
I also enjoyed the fact that the gas, whilst chasing you, doesn't permanently doom any place that it passes through, since it eventually dissipates. It'd be interesting to have a clearer visual signal to when the gas completely dissipates from an area. There were times I thought the gas was gone and ended up getting damaged because there was still a bit of gas left that was hard to see.
Another thing I noticed: to close the pause menu, I can "Resume Game" or press "ESC" again. However, when I press ESC to quit the pause menu, the camera, instead of following my mouse's movement at all times, only follows its movement when I hold left click and drag (my cursor also becomes visible when this happens). It corrects itself when I close the pause menu with the Resume Game button, but I thought it might be worth to point that out.
There were also a few times in which the gas seemed to move really quickly. I think I just didn't really get a good grasp on how the gas works.
There's some really small things I noticed that I could tell you in Discord if you want, but in an overall, the game works really really well! The models are nice, the environments are quite detailed, their variations have their own small personalities due to the presence of rooms, layouts and objects that are exclusive to some of the variations, points and powerups feel satisfying to collect and I can see a handful of pathways this game can take.
It's a game with a honestly huge amount of potential, and it's really fun to play! I had a very good time. Well done!
Got 52,000 points!