Thank you for playing! I'm really glad that you liked our art style :)
And as you say we should implement a tutorial lmao, Double Jump works with charges and you use it with right mouse button and you just switch the ability with R.
The whole sprinting should be pulled off but it was part of the sliding mechanic which is implemented and is pretty much working correctly but it isn't even utilized that well I think. ANYWAY thank you for playing it since no1 bothers with downloading games and your feedback <3