Hi Brick Wall Games,
Thanks for playing our little game and take the time to give us feedback.
We agree about the implementation of a checkpoint system that let you try faster a section you end up losing, and not needing to go through all the previous parts again. We will try to implement that in a next update.
And yes, that tearing problem was something we also hate but at the moment didn't have the answer to fix it. Again we hope to fix it in a next update.
We also check Split in Three, and we love the puzzle mechanics. We rated the game and leave you our feedback there.