This is an amazing and addictive game! I'd gladly take an hour or 6 to play it! But there is ONE problem I have so far, say I have 50.21n^3 H and 100.49n^3 O, I want to spend my oxygen instead of helium, because I have more of it. The thing is, I can't because the game won't allow me select Oxygen. Either I'm doing something wrong, or it's some sort of glitch. Could you help me with this please?