Not necessarily a bug, but there is a clear difference in using click pistol's spread ability between windowed and full-screen. Perhaps consider making the pistol spread a fraction of the current window length?
Just to show how rediculously easy this game is, I put it on full thrust going one way at 50k ft, left, came back in 5 minutes, and it had climbed to 65k ft!
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Good catch, this will be fixed soon. Thanks!