Perhaps i should rethink how i do the life system. I intentionally made it so you can't see them to not distract while playing. The holes lock themselves when the timer runs out. Actually it was made by an accident, that the balls block a part of the holes in the back but I figured it makes the game harder and that's the effect i wanted to achieve os i left it that way. Still i appreciate your opinion and it helps me to grow as an developer. Thank you :D
It definitely makes the game a bit harder, but in my opinion that is bad way to make it harder in this case. It felt to me as a player that game was… cheating. It was hard enough trying to switch the right holes under time pressure in 3D environment. If you want to make it even harder here is one suggestion: make more shapes and with right mouse click hole will change shape. Now player has to act both color and shape. Of course now you have to give more time, but player testing helps to get it right!