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Its basically mesh editing that is shown in the video. Not really much boolean CSG going on there…
On that level, a 3d package is surely more powerfull than what is shown in the video.
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Is basically about have a plug and play level edit, that you can press play if you don’t like something back to the editor and edit something auto UV and collisions generation and press play another time and test the level 
and a control about the sizes and vertex locations.