Ah okay, I think the overall level of quality led me to believe lt was a bug instead of a feature haha (it's a game jam game after all). So assuming it was a feature, I do think it works! And I know I got the effects because I noticed small differences, but I didn't see the icon for it until the third round (it's very shrouded in the background).
You should probably find playtesters, anyone would work. As long as you don't just go solely based on your team's opinions. That's why I believe our game became as polished as it is, because we held like 4 different playtests (and played it ourselves many many times). But it's just my personal recommendation, you've all still done a great job :>