Is the jump dependent on frame rate? I couldn't clear the first jump on the first level here. I like the style you've started here, but I couldn't make any progress playing the game because it always comes up short. Thanks for making and sharing your game through!
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Updated feedback: now that I realized that double jumping is a thing, I played a few levels. Rather than focusing on more levels, it would have been awesome to see you polish up the gameplay on the first one or two levels and make 'em bigger. Things like being able to easily restart when running out of energy/no windmill and tweaks to the player movement and platforming to nail the "feel" would really level up your idea!