Great game ! The gameplay is solid.
It's pretty calm, despite the oxygen is limited, there is no fell of hurry, the limiting factor is the thruster.
It need some more work on graphics , but it have the advantage of making the level readable.
The SFX need more work too.
The background music fit perfectly.
The level design introduce all seamlessly, great work on this.
But in the end, the fun takes over, and I played through to the end with enjoyment.
Congratulations.