Thank you all for playing and for the feedback!
@minibobbo, about disappearing lamps on the hitting of the space button - I suppose your situation is the result of two bugs - first bug is that Restart button does not lose focus after click and thus triggers on the space button click (as a temporary solution it is possible to click on the starting element - it will change focus and will not cost action), the other bug is some error in the restart code, which leads to the odd changes of tile types distribution.
@wiredsound, UI really should be improved, or at least fixed, as restart button changing position is not intended and score "successfully" lost its gray background on the web version.