Very cool game! There's a lot of content here. Different weapons, lot of platforming challenges, multiple boss battles, plus even some story. The art is very well drawn/animated, and the limited palette works great for the low resolution. Music and sound effects are similarly high quality.
I like the creative ways the weapons are used in platforming, but some of the platforming challenges are a little finicky. The rocket jumps are tricky to do consistently, and it's hard getting the bubbles in the right spot without making them too high to reach or popping them on walls. It might've helped to have simpler weapon switching (e.g. rocket on left click and bubble on right click) to make combo moves easier.