get in the robot
What is the small 「ぁ」doing in 「めでたいなぁ」 and the tilde in 「おめでとさ～ん」?
Stylistic choice and whatever feeling you want to convey, it's like the difference between "hey", "hey~" and "heeey"
I've never seen it written in kanji before.
For those who are wondering, the full form is "おめでとうございます!"
The shortened form is, I believe, akin to the English "Congrats!"
Congrats is accepted as an answer here
But not, bizarrely, "well done!".
On first listen, I thought I heard オムレツ.
It sounds like "Homo Erectus" just that almost sounds like in Portuguese.