Cool idea but was unable to continue quite early on. I wasn't small enough to fit through the doorway despite spitting out all my matter.
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Thanks for playing!
Yes I've had other people run into that bug - you should be able to get past it if you absorb all of the light blue blocks fully in the initial hallway and stairs, and emit all your matter to the dark blue block when you reach the door.
Make sure you emit to the dark blue block first and don't try to absorb it (the bug is around absorbing those dark blue blocks as your first action on them).