Nice presentation, and I love the little Easter egg-like touches like going out of bounds leading to a shortcut, the hidden ape logo, etc. Of all the things to knick from Half-Life, why crouch jumping? Or is it supposed to be a Super Mario Bros 2 super jump? Either way it's super awkward too because you can't just with W and S is crouch while stopping all horizontal friction.
In the end, I got to frustrated to bother restarting over and over and over from the start with one hitpoint. So I didn't finish. I'm not into punitive platformers.