You should definitely be able to use a combination of all the upgrades (including slide) to get to the required areas! Can you post a screenshot of where you can't reach things?
okay, got a bunch of key cards. there's still areas left.
here's how my current map looks like and especially some kind of exit area that i cant enter:
https://ibb.co/DYWpDVy
so the most bottom area is obviously blocked (even though i havent been down there again so i dont know if the keycards I collected changed anything).
and the above mentioned exit area.
aside from that it's jsut one or 2 corner that I havent visited yet.
Edit: Oh and what I wanted to say since the very beginning:
what is really annoying is that when you are in midair and free, not pressing any direction, boost does a simple jump .
but when you are in the same situation but next to a wall, in most cases the jump just doesnt happen.
maybe a thing with collision detection?
cause it sucks to get jnext to a wall, just needing one simple airjump o get the needed height. and then boost fails and you fall to your death.