Edit: I just realized that this bug has already been reported, sorry for the duplicity.
Hi, Claudio.
I found an upsetting bug in level 2 in which the hydrogen storage can't be purchased after approximately a day after game start. The icon appears lighted when you have the money, but clicking on it does nothing, not even the color change of "being pushing the button". I am surprised by the obviousness of the bug so I wonder if I'm the only one having this issue.
Great idea for a game, keep up the good work!
Regards.
Edit 2: As reported before, repeatedly clicking all over the button allows to purchase the hydrogen storage, although it opposes some resistance.