Ah thanks for the reminder on the fullscreen button. As for the jump height, that's a bit of an oversight of the level design. You can get higher jumps and double, triple, etc. jumps on level up if you roll one of those buffs, but we'll probably be updating the map a bit so you can get up without those in our update today to address some other bugs (including getting the music working).
Thanks for playing, super appreciate the feedback!