I reviewed you game here:
Viewing post in Treasure Trawler jam comments
Hey, thanks for checking out the game, I appreciate you sticking with it as long as you did even through the issues. Sorry for the frustration!
This is my first game overall, as well as my first time using construct and posting on itch, which is the source of some of the problems. The jump is the part of the game I'm most unhappy with, I never got it to behave the way I wanted and I got so used to the controls that I also didn't lower the difficulty accordingly. It is possible, but the controls are really finicky, needing a run up to clear basically anything, including jumping up onto a small ledge.
I realized after it was too late to change anything how easy it would've been to give alternate controls and fullscreen, that's just an oversight on my part.