For something made in five hours, its pretty solid - but a few additions from the first build I played at the start of that definitely feel out of place.
I feel like the timer detracts from the best part of this game - getting the puzzle through and experiment. You're rushed for each level, so you don't have as much room for error - meaning a mistake that costs you a few seconds could mean having to redo the entire level again from the start.
Some additions work quite well, like the implicit tutorial for how to fling yourself around corners, but felt weirdly placed. These are all things that with time can be hashed out and fixed - a luxury you didn't have - but it all worked out pretty dang well.
For five hours, it's a pretty solid proof of concept that could certainly have fangs if taken in the right direction.