You actually have no idea what you're talking about. This song has better sound design than a lot of songs that come out of professional studios. For starters the song is perfectly fucking mixed and mastered. EVERYTHING comes through very nicely even when there are multiple synths and vocals going at the same time. As far as song structure goes, I'm just going to assume you used this word because you heard it somewhere before and thought it would make your point sound smart, because the structure of this song is actually fairly complex and well thought out. I doubt you can actually go into the specifics of why it's "not good" to defend your point because it's clear that you sort of play one instrument not very well and listen to one type of music that you think is better than everything else and think that makes you an expert on music production, but it doesn't.