I would have opened 1♣, but an argument could be made for 1♠, I suppose. It is a major, after all. OTOH, if you decide the hand isn't strong enough to reverse (debatable - it's only 13 HCP, but it does have only four losers) then you don't really have a rebid after a 2 level response in a red suit. As others have pointed out, opening 1♣ keeps your options open, and doesn't distort your shape (if you open 1♣ and rebid ♠ twice, you must have 6♣ and 5♠ - or 7 and 6. :-))
2NT was, well, pretty bad, but once you decide to open 1♠ and not rebid 3♣, you're kind of stuck.

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