Thank you very much! I think in general I should have made the levels a bit smaller and the gaps a bit larger, but a glowing outline like you suggest could help as well. Maybe some sort of pick up in each level which reveals areas which can be squeezed through. :)
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I think the level size was quite nice I’m not a fan of small rooms that make you feel claustrophobic in games (or in life) I like the idea of a pickup or even like a particle effect you touch that will fly over to an area of interested, another solution would be putting bright lights in the next room that way the light from the next room shows the gap. I enjoyed it how it was though.
I also don't like claustrophobic conditions in games, despite having made a game all about squeezing through small areas! 😅 I think I erred a bit too much on the scale of the environment compared to the player, but I'd have to look at each section of each level to see where things could be improved.
I did try to put bright lights near to the first unmarked gap in the tutorial level but I couldn't get it to show up clearly and kind of gave up on that approach as a result. If I understood lighting in unity better I think it would have been a great approach.