Pretty polished. I like that you implemented coyote time and jump buffering and it works nicely. Often jam platformers without these are a bit frustrating to play :) Also liked seeing instructions / controls integrated into the game. Would be good to be able to rebind the controls, but not a huge deal imo.
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Oh yeah, I actually figured out a new way (for me) to implement jump buffering that worked really well. I put a raycast below the character pointing down, and just have its length set to an appropriate value and if it's colliding and jump is hit, queue up a jump. It worked perfectly and wasn't difficult to control. Coyote time was a more normal implementation. As for rebinding the controls, I tried, but was struggling within a reasonable amount of time to get that working, so cut the feature as soon as I could tell it was going to impact anything else. It's a great idea though!