It's definitely a viable strategy, curious how you managed to get past some of the later enemies though.
I don't remember ever putting in a method for the player to escape, perhaps you mistook flying off into space as an escape route?
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Ahh yeah, that would be cool.
I think it'd kind of go against the tension curve a little bit, getting to the middle is the high point of the danger in the level, so getting out again could feel a little bit like an anti climax, but maybe if there was some interesting stuff going on with more spawns coming from outside or something it'd work.