I noticed people often find it pretty unexpecting, definitely should've made it more clear.
If it says you died from asphyxiation, then that means you have to remove the lint from the vent.
If you died from hull damage, that means that the tentacles broke your vessel. Basically, your glass will only crack so many times, but the tentacles will still do damage. Definitely should have made a sound effect or visual cue or something for that.
Thanks for playing my game, glad you enjoyed it!