Thanks for the comment! with the hitbox thing, it might be due to running out of gas, maybe missing or not collecting... the player hitbox was meant for hazards and was made thin, so I could see this happening. I haven't seen a gameplay gif so, I really can't tell for certain.
Implementing an extra bit sub-text to the "GAME OVER" screen would likely be helpful (e,g, "GAME OVER" "(ran out of gas)" and "(hit by hazard)").
I'll try your game when I can, like the style from what I'm seeing in the preview.