IMO, it looks dry, because an exclamation mark would be more appropriate. If you just omit the punctuation, it can be interpreted as if you omitted the "!", but

IMO, it looks dry, because an exclamation mark would be more appropriate. If you just omit the punctuation, it can be interpreted as if you omitted the "!", but with the full stop you explicitly say that you don't mean "Yay!".