I'll give you my comments from the audio perspective.
I realize that you're using canned music for your score, but it's too monotonous. There needs to be a more distinct change of mood/emotion for each sequence - Preparation, Process, Progress, Purpose; each should have its own theme.
How funny you mentioned the knife sound. I actually had a traditional sword unsheathing clip to fit with the retro feel but I took it out because it made me feel less confident in the final piece. Maybe I should get it back in there...
In a film with no dialog there is lots of room for some interesting sound design. Your "sword unsheathing" sound didn't work because the protagonist is not unsheathing a blade; he's pulling a switchblade from his pocket and opening it. So the sequence of sounds should have been the removal of the knife from his pocket and then the snap of the blade opening. There could be a very short unsheathing type of sound as the knife opens to enhance the dangerous nature of the weapon.***
I will give just a few more examples of how sound could have greatly improved your short. For instance, the cinematography in your Preparation section is very static. Your protagonist could have been putting things into the plastic storage bag, picking up the car keys, picking up the knife and closing it, and the sputtering & guttering of candles, allowing more opportunities for sound design. I would also Foley everything and use non-dialog vocalizations (breaths, grunts, sighs, etc.).
(BTW, putting the knife in his pocket and the collection of cleaning supplies should be in Preparation, not Process).
Vehicle sounds can also be quite effective. You could also have used a navigators voice when the GPS/map is seen. Gas station sounds @ 00:53. Again, Foley and vocalizations at 01:19 when he is laying on the car seat.
I won't continue, but you get the idea. Non-dialog vocalizations, Foley and sound effects (including ambient/background sounds) can hugely enhance a project, providing character & plot information/motivation and heightening the tension.
For a first attempt you did quite well, so don't take critiques negatively. Our critiques - or at least my critiques - are aimed at making you a better filmmaker.
***Solid sound design is not about choosing one sound, but working with layers and sequences of sounds. To further my example of the removal of the knife from his pocket and then the snap of the blade opening the clothing Foley would give more menace and purpose. Just for fun, it would probably take me 20 to 40 minutes to put all the sounds together; it takes some time just picking the proper sounds for the correct emotional impact, then they need to be synched properly.