Not bad, but running time was getting annoying by the end. Maybe an upgrade for sprint acceleration? Which also makes it extra important to make sure there's no holes in the path. Or maybe make it so upgrading the magic boots increases the speed and oxygen consumption, so you can use it for quality of life but it doesn't become OP.
Spoilers (rot13):
V thrff whfg vtaber gur hctenqrf ng gur raq? Gubhtu gur ceboyrz vf vs lbh pyrnerq n fgenvtug fubg gb gur raq yvxr V qvq, gur raqvat vf whfg obevat, fb univat na hctenqr gung znxrf vg zber vzcbegnag whfg znxrf gung zber yvxryl gb unccra.