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Or can you just repeatedly click a few times in advance?
In the case when you take a hit, there are 0.1 seconds to avoid losing a life; I can do this quite rarely, and if my reaction were better, it would be easier.
On the other hand, these games only require reaction time about 50% of the time; the other 50% involves memorizing patterns, understanding the level, and planning a route for completion. You use bombs more often in the most difficult moments or when you know in advance that you won't be able to dodge (or, no less often, when you panic).