I was finding this game a really good mixture of challenging and fun when I started the first level. Eventually I discovered I could run onto the ceiling and take shots from up their, and was worried that all the levels were going to be trivial because of my cheese tactic. I was so glad to see the variety in level design that makes staying at the top of the screen an imperfect solution.
The mechanics of this game are so simple, but also really fun, and I thought it was delightful. The physics of the game behaves in a consistent manner, and I didn't notice any collision response with outlandish results. On some levels the player character would sometimes fail to run up to the top while squeezing past a partition, and occasionally I could get them to not flip around the corner and onto the next wall. These are really minor problems however, in what is otherwise a solidly built game.