Hey this a pretty creative idea! Maybe you can make it a bit more clear that you can kill enemies when you double jump onto them. Some more checkpoints and a bit less enemies would also be nice. I got to this part in the second level where you need to jump over a hole with the eating plants and the yellow bubble just below the edge of where I start from, but I can't figure out how to get to the otherside.
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More checkpoints were definitely something a couple people mentioned. I had creator blindness from some of the harder sections and unfortunately getting play testers in a couple day game jam is kinda hard. But thanks for the feedback!
And as far as where you're stuck at, if you fall off the ledge without jumping then hit the yellow bubble, you will get 3 jumps and can make the jump across the gap!