I did try both, I found a lot of the time the blocks were rolling when the colour was up so wasn’t sure which face I was matching. This may be more to do with me than the game.
Have you tried the updated version already?
With the additional visual feedback it emphasizes the front facing side of the blocks while they are vulnerable.
If you think it difficult to find out how to play because it lacks feedback on players' actions then it's the game that needs to be improved. But then, having games that need polishing in their game-play because they lacked play-testing is certainly part of game jams...