I really liked what I played, but found very difficult to progress. I think I got the general idea, but I was frustrated that sometimes my 'up' input wouldn't register, and I wouldn't jump. Not sure if this was part of the design or not? But it's a really great idea :)
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First of all, thanks for playing! Small insight in the jumping issue: if you press the jump-button before the player is registered as being 'on the ground' it will refuse to jump, even after you've landed. This, combined with a tendency in players to try to jump slightly before having landed, means that it'll seem like the game is refusing to let you jump. If given another go at it this would definitely be on top of the list for changes :').