Thanks for the lengthy feedback.
I'm aware some of the features are half-broken. I'll probably have to scrap some of them like the depressurization and air mechanic because they're quite buggy and I'm not sure if they add a lot.
My next plan for the game is to do a design document and clean up the code. I fear got a little too much into a feature creep. I need to think what I want my game to be about and have a clearer idea of the work ahead.
Progress is really slow because I don't have discipline and have low motivation at the moment. However, some work is being done on the assets. Posts like this not only contain useful information but really help me get back on track so thank you.