For an actual first level you made, it was pretty nice to go for shells and then hitting switches like that to navigate the shell so you can beat the level like that. Simple yet it was nicely done.
This is a really great level! It provides a pleasant challenge. Maybe it was a bit short, but the puzzles never got stale, and I enjoyed it. You also used the vanilla tileset very well! (Well, this wasn't based around environment but you still pulled it off)