from what i can tell, offset seems mechanically impossible unless theres a trick we're meant to learn from levels past variety
well it seems that theres 2 potential solutions, both of which require lowering the red block
1. somehow lure the left and right moths in 1 and 2 block increments, which im not sure is even a mechanic as any 1 turn movements that both expose and hide the light (in that order) don't seem to lure them
2. manage to lure the moths while blocking the web squares, which would need either a way to escape webs or somehow unmelt the ice. i havent found a method to do either (tried melting blocks on the webs to no avail)