Pronouncing ł as w blew my mind - ukrainian chiming in

I'm learning polish and I'm having these 'aha' moment of why it's easy to understand when reading (because I wasn't pronouncing letters correctly lol) and listening. Like rzeka (river), reka makes sense, but I would have never guessed what żeka is. If polish pronounced ł as l and rz as r, my understanding of polish would increase 2 fold.

I'm curious, what does ukrainian accent sound like when talking polish, what are the common give aways that youre talking to a Ukrainian?

I live in a different part of the world, learning just for fun.