Transcription of Rise, Igor Khabarov

This piece needs big hands to reach chords of an octave + third, as c - g - e:
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On the video, my left hand doesn't play the chords as they should be :( I searched for a kind of thumb extension, I tried a thimble, but it didn't work. Perhaps I should try this idea ;)
So I put the extra notes in the video: you can hear them and see them on the upper keyboard, they have to be played with the left hand thumb. Perhaps this extension of your left hand will be painful after a while.
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It's fun to discover the patterns of a sheet. At 0:55 I hear this:
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But this makes more sense, with the 'big hand chords' in the left:
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