I like hard games and platformers, but man this is so brutal and unforgiving...
For me to enjoy it, you would start at the beginning of the level, not the whole game. The timer just kills you mid-run, and makes the level harder while you already struggle; even if a good concept, I would remove the timer. And for the levels themselves, either make the pink balls not kill you or don't put so many spikes. I also didn't understand the canons, sometimes they would shoot red, so I couldn't progress while the timer is going down and we only have 20s to spare.
But it's clear a lot of effort went into this, the production is very good and it feels good to play. I enjoyed the first 2 levels and basing it off of that.