Level E3 feels like it wasn't well tested, as it is a mess of figuring out how to know who is in the center of a fan, its such a mess that I got the achievment for only failing on the edge cases on that level, but it was because of movement and not size, so I had no idea how to fix it, and I accidently erased that solution, which is my fault. But that solution was kind ugly anyway, so I didn't like it that much.
also the sandbox should have a mode where you can just place commands and mess around, which would use an on-screen button, as the game works shockingly well on mobile, and I would like to mess around on my phone, or just mess around without knowing how to code in general.