I really liked this game, played all of the levels until I looped back to level 1.
Level 8 is easily the most difficult of all of the levels, due to the precision jump.
What was "stomp" supposed to be used for?
Overall: getting started with the game is a little rough. I appreciate the "H" menu, which I referred to frequently as I started playing the game. It was not explained to me that I needed to move the mouse in order to place sand.
Fun: building sand bridges was quite interesting. I'm sure there are many ways to expand on this concept by adding special per-level restrictions for placing sand, or different types of sand.
90s: this game could absolutely run on a Sega Saturn.
Visuals: the volcano was an interesting and unexpected surprise. The art style was consistent through most of the game. Some of the UI could be polished.
Sound: nice sound effects.