If I had to describe this game in one word, it would be intuitive. The controls are so easy to learn that a tutorial or instructions are hardly needed. It's not just the controls: the different mechanics such as the moving walls and the hole at the end are self-explanatory for how they affect game-play. This game can be picked up and played almost instantly, which I think is a considerable merit.
One bug I found was that if you charge your shot for too long, you'll go through some of the obstacles. I found this bug on the stage with the three moving walls in a line. However, I think the game's merits far outweigh any flaws it might have.
Very nice concept and wonderful as a hyper-casual game, nice work!