That's useful to know - thank you. The game is a mix of rooms, where some have no puzzles in the room, and the key point of those rooms is to develop the story. For the other rooms, the puzzles are all pattern/sequence based, with the clue for the pattern sequence shown at the bottom of the screen (reading left to right). So for example, the first cloud section that you need to cross (after coming out of the cave), the colours of the clouds you need to stand on are shown at the bottom of the screen. It's the same for the next room as well, and with all of the other puzzles - all pattern based. With the Hattifatteners room, that didn't work as well, as it was was just an avoidance puzzle, and I now think it's difficult to gauge distance from the 3D angle I chose.
I appreciate the feedback - and now I can understand why a few others mentioned that it was frustrating - they never followed up on why it was frustrating when I asked them.
Thanks for the thumbs up on it in general though. It was created in using Aloelazoe's 3D Bitsy https://aloelazoe.itch.io/bitsy-3d , which is based on 2D Bitsy https://ledoux.itch.io/bitsy.