Turns out there was more strategy involved with this than I thought! Once you start opting for rainbow cubes only, then it's actually possible to get past that highest medal even without rushing things. Clicking lines one at a time it seems it just isn't possible, and that both bad luck and the falling animation (which both eat a little time) easily get in your way). But getting five in a row isn't the easiest feat, so it's much more of a puzzle than reaction-based game when that's what you start to strive for.
I like the idea, used as it may be already, and the simple but addictive mechanism. Seems like there might be a pretty advanced formula involved with regard to what blocks come falling down too, as I never ran into a situation where there was just no possible match at all. Curious if it's possible that can happen here too? It feels balanced though, light, fun and easy to play... and replay... again and again. A little aggravating at first, but once you succeed it was worth it after all. If there's any one thing I'm missing it's a quicker way to replay (just a button would be good). Though I understand you might want some extra ad rev via the menu.
Oh, and greater reward for combos/explosions too. Feels like those are all somewhat undervalued.