I agree with everything you said!
Positioning the slugs before shooting was the intention of some levels (3rd and 6th) but overall it got players very confused, so maybe I should have explicitely told them that.
The salt crystals serve as an indicator as the snail cannot move past them. It is true that I didn’t mention they didn’t have collision 😅
Thanks for playing! This was my second snail-themed game in a row, so I definitely had space dino colossal shells in mind :D