I really like the potential this has to be a very memorable game! I'd say that by tweaking the controls just a bit more to not make the sprint jump feel so slippery and by mapping the sprint to another button you are in to make your title shine even more :D
Since I know custom keyboard mapping is a pain to add to a game, you can go for a better keyboard layout like move with A and D, jump with K and sprint with J. If you want to use the arrow keys too, left and right for movement, A for sprinting and S for jumping. Try and experiment with the key combinations you feel more comfy to use though!