There's an occasional bug, whereby a triangle can turn white, as if it's about to explode... but never does. It can't be killed, and counts against the count at the end. Encountered it twice on the last level.
It's a fun game, however input delay is extremely frustrating. Not hammering keys, either... just sometimes input will take up to 2 seconds to respond, or even not respond at all. Bit of a problem with a game that's essentially all about reaction.
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