I wasn't a big fan of the way the bombs switched back and forth, but once I got used to it and saw how the levels were constructed to work with it, I ended up loving what a cool design decision it was! Love how satisfying and fun it is to get through the challenging levels by getting better and better at utilizing the bombs in all sorts of ways: you start off easy with simple bomb jumps, but later on you're chaining together complex combos like jump into wall-bounce into bounce and so on. It's a bit silly in a way, but the bomb switching did add a necessary complexity and rhythm to the game that felt good to get under control and tame with skill.
The game did have a few wonky aspects. I kinda hated how the player has a bit of a momentum to their movement and ends up drifting: this made me end up going into a lot of spike walls which had bigger hitboxes than I expected. (I understand it's most likely necessary because of wall bounces and such though). Speaking of hitboxes, the hitbox from a bomb explosion also lasted a bit longer than I felt necessary, creating weird scenarios where you run into a dying explosion and well, die. I wish the game had a cursor lock so I wouldn't click off the edge of the screen and end up losing control. A minor nitpick, but I didn't like how when you're looking at the notes it doesn't pause the game. But really, I feel all my complaints are quite minor compared to the fun I had.
Anyway, well done on this! I had a blast, bombing along through the levels, all to an addictive jaunty pirate tune that's still stuck in my head!
EDIT: Woohoo, Galleon Bertha is complete! What a wild ride and amazing ending: didn't think the game would escalate that much!