Nice, a little basic but nice :) Would need a proper level design . Also some collider work on the platforms-rocks, sometimes it was hard to perform a jump from them.
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Glad you enjoyed the game. Yeah, some of the colliders need to be scaled a bit differently. The checkGround method can mess up on angled surfaces and not reset the double jump counter, which I was trying to fix. I tweaked the numbers on that because the player would bounce a bit off the floor and cause the checkGround to be weird.