Decent mechanics and game loop. I felt around with the controls before I realized they were in the description (I should probably scroll down first before a game in the future, haha).
Sometimes it's difficult to get a feel on the sense of distance when aiming, so you have to switch views often to estimate the cannon position as well. Additionally, for some platforms, it's more of a trial and error when you miss until you get it right, meaning losing 2-3 points until you just regain 1 point in return, which throws off a feel of a highscore system and takes away a bit at the fun.
Aside from that though, the art is pleasant and the music is calming as well. The cannon blasts did scare me a few times from its thrust, haha xD. And sometimes I made the same 1 bell "ding" twice, so that was fun. I'd say you did pretty well on that bell concept, bells ahoy!