First of all, the connection to the theme is a bit loose. If we're talking about acid rain it either means literal rain, or just a ton of acid. Unfortunately this game didn't fit both of those. I'm not saying that it's bad. I just had to say it.
I like the concept of platforming on moving arrows. It's finicky in this current state, but with a bit work it could look great.
Many arrows spawned at once. Not sure what's up with that. And the golden arrow(s) spawned only at the top. Maybe some more variation could do.
Also nice music and sound effects.