Top-Graphics, amazing Gameplay Design, all Perfect and I Like it! Sadly level 14 is unsolveable (was not fun), but the game is still good for unfinished demo. The only mechanic took me long to figure out is how to press a button without crates (by walls). About WebGL performance, maybe some audio glitches at level transitions and on browser tab change are related.
Waiting for expansions and fixes. Please keep up the Great Work!
Here is my walkthrough: