EDIT: Never mind. I didn't know what a "Ludum Dare" was. Now it makes sense, the author made all this in 5 hours, literally. Quite impressive for that time frame indeed. Check it out https://ldjam.com
Hmm "half game / half trash" eh? Well at least the author was straightforward. This isn't a game, more like an experiment and a short one at that.
The "game" consist of three "levels" each one testing different mechanics: gravity, movable objects and jumping.
Each one is barely two minutes long. So don't expect more than 6 minutes of gameplay.
Quite frankly I don't know why he uploaded this thing. What a waste of time.