Unfortunately, what you encountered was not a battle system but an unfinished placeholder minigame where you were supposed to farm tolerance to get more teeth and tissue without instant game over. "Teeth" were supposed to be used with "throw" command to deal a ton of damage without retaliation from enemies but were VERY limited in how much you get and "tissue" is used for "healing".
As for hanging at The Esophagus, that's where the game currently ends. I've failed to iron out a competent battle system in time and had no enemies introduced in The Esophagus even though I've made the assets. Hell, looking at things as is, there is a ton more work needed to be done before the project will be considered "acceptable", thinking that i'll be able to do things in a week without productively working with Godot ever before was arrogant on my part.
