Some criticisms:
- I had no idea what to do at the start, just something like "Add/remove cubes to construct pathways for the entities to reach all the checkpoints and loop back." would have been very useful.
- Entities moved too slowly, a faster speed or option to speed up would have been useful.
- Sometimes I managed to complete a level before the entity looped back to its starting point, perhaps a bug.
But otherwise, great game and I enjoyed it! Even though it's small, at least you managed to add more content than I did :').