I sunk more time into this than expected - I love the upgrade system combined with the one life mechanic! I found myself keeping track of previous runs that failed for some reason or another so I could get a bit further.
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The bomb has a 1 second timer. If your reaction time is quick enough, you can drop a bomb and sneak through to another component before the Megataur can land on you.
(That's my lazy way of saying the lack of meticulous constraints in level design became a feature during development :p )