This is really cool. Quite a nice challenge. Only problem I had was that it ended too soon ;)
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I see some other people down here saying that this is "too hard", "not a puzzle game", or "the tutorial is too vague". In my opinion it's almost perfect; a lot of games nowadays feel too easy because the developers want to appeal to casuals. And it is a puzzle game: you have to figure out the velocities and the paths in your head; however it challenges your mental chronometry and your kinesthetic skills by necessitating movements that are both fast and precise, which also makes it a "skill game".
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I do have one suggestion, though. While I was playing, I found it fun to try and challenge myself even further by trying to complete each level in the fastest time/with the least number of "moves" (disconnecting and connecting/touching the least amount of boxes. The achievement I'm most proud of is completing level 35 in 2 moves. I just wish there was tracking for these stats; maybe even a competitive scoreboard..? That would be really fun.
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7/5 good game, would revisit in 10 years for nostalgia purposes.