I really enjoyed the demo, but I have a few suggestions.

First, holding down L3 to sprint is extremely uncomfortable on my thumb. It should act as a toggle, where clicking it once goes into sprint mode until you stop moving or press L3 again. It would be even better if we could remap the controls.

Second, double-jump should be bufferable. Currently, if I try to double-jump too quickly, nothing happens. Instead, the second button press should buffer the double jump and perform it automatically whenever it becomes available.