The Sheep Launcher move I tried at 27:47 was actually pretty tricky to pull off. Here are two ways it could work (see attachments #1 and #2 – note that the retry counts are independent on these two; the first one took 5 tries starting from scratch, and the second took another 19 tries starting from what I'd already learned from #1).

There was something else I could've done, though. A Flame Thrower double kill is easier, but there's an even better way it could be done to not only kill the two worms, but open to the left (see attachment #3).