Since this game is x64 only, we need any x64 user to write down here full name of .exe file of this game(KIWAWI helped us here already). That's gonna help all of us x86 users alot (since there's nothing else to do bout it, like really play in it).

Its quite known problem, and solution is this - u take any unity game .exe u have installed (or maybe any other .exe, i don't know exactly since i didn't actually tried that option with other games, that have same problem), and put it to the game directory, rename it to MagmaTsunami.exe and start it. Ur gonna see error message on ur screen - don't touch it, cause steam thinks that game IS working. Then u wait for a couple of hours to get ur cards out of this and...the end. Many thanks to x64 user that helped us. Bless u.