It's designed for a minimum 540x960 screen size. If your resolution is smaller than that, that may be what's causing your playing issues - there is a play button at the bottom rights of the screen to get started that you may not be able to see.
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yeah figured it now, but it didn't work on my phone, it went on portrait mode and I couldn't force it to go landscape either. Strange. Couldn't see the entire text nor the button because of it. My mobile phone can easily play at 1920x1080 too (or 1080x1920). On PC it worked fine though.
Game was very enjoyable, though I feel that the "robot?" flies very fast, I am constantly pressing the down key to be able to shoot or pick up rocks for money. Managed some highs core still and am on the leaderboard (yay!). I like games where you can upgrade and get further. Really nice concept game and would love to see it get developed further. Can become an excellent casual mobile game.