I'm not keen on the song the slightest bit.... but I honestly cannot for the life of me hear the Euphoria comparison. "Euphooooooooooria" - "Gloooooooooooorious" thats the only similarity. The title of the song and the way the two words are both sung with prolonged "O's". Thats where the similarities start and stop. People shouting "plagiarism", lord above help them. Apparently Loreen created the dance song.. Funny because I thought I heard "Euphoria" on adverts for ministry of sound compilation albums about ten years ago. Dance songs almost all share the same beeps and bleeps created by a computer somewhere.
This is not a plagiarism in a technical sense but it's definitely more than just being in the same genre. The chorus has the same structure basically, a bit faster and a less 'dark' production. To evacuate the dancefloor, for example, is completely different even though it is a dance song as well.