Testing it I definitely died quite a bit, not sure what that says about me! The big flowers weren't checkpoints, but I think that would have been a great idea if the level was longer!
Also, could it be that you have framerate-dependent logic? I.e. if you have higher FPS, the game or perhaps just the enemies might be faster for you. My current monitor is 60hz, I used to have a 144hz one and have seen this issue before in jam projects.
