Game is very minimal. Feels more like a tech demo than an actual game.
My biggest suggestion would probably be that the player needs some sense of progression.
There is a difference between repetition and recapitulation. By giving the player and evolving challenge and some way to get actual better at the game, they have something to aim for. Without a sense of growth, most players are going to lose interest fairly quickly. This is one of the key skills in game design... how does one maintain the same core gameplay loop (whatever the game is about), while also keeping that loop fresh by introducing new elements that build on the players existing skills and challenge the player in new ways.
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