Add a settings menu to toggle stuff like sound effects, voice lines and mouse sensitivity with slider bars, pick resolution with auto by default, also master volume and music if you guys add bgm.
Need to fix the formula for the voice lines, they are not activating most of the time if you fall over 30m, even after falling like 100m, or vice versa they pop with a small one. You can also make it so it triggers mid air rather than when it stops falling.
Also after certain points/stages it's pretty much impossible to fall to the bottom, the most i've seen is about 150 to 200m fall, and games like this usually have moments where you can screw up and fall to the beginning, like Getting Over It or that Chained Together one, so maybe you could position some blobs, jellies, inclined surface, etc., where you would expect the player to land to achieve a harder fall if they do it in a specific way like if they over shoot to the edge of the screen, or some other very bad jump at a certain point?
You also wanted to make the bubble pop when it touched an urchin, if you do that you may also want to make the bubbles be more sensitive to touching stuff, specially blobfishes, so maybe like if it touches another surface add an effect to show it's affected and reduce the duration by like a second or so, harsher if it touches a blobfish, like 2-3 secs, and maybe not affected only if it touches a jellyfish since that's like the softest thing in the game? And you could also add an indicator when the bubble is about to pop since the duration would change depending on collisions now?