I think I set my bar a bit too high trying to do this song but I've worked on it for quite a while and I think I got it mostly down. These are the parts I'm stumped on.

シレンジャー
Since this song likes to use a lot of random katakana, I figured this would be
試練じゃ, like "What an ordeal!" or something of the like. Elsewhere though, I've seen it taken as 四レンジャー, as in "four rangers"

チラみせんあんてありきたり
I have no idea what "チラみせ" means. Also, is "んあんて" supposed to be "なんて"? like, another one of the song's weird little things or a typo?

うんだかだーうんだかだーう
...dur. No idea here either.