Good game! I liked the environment, and having a limited time to find the path forward.
To be a little more specific on the collision detection, there are some areas where you can hit walls when it didn't look to me like they were touching. Here is a screenshot showing an example of this, this is as far as I can go to the right without hitting the wall:
Other than that, I really liked the visuals, it had a nice murky underwater effect!