Yo thanks for the review, I am very thankful That my game has been getting more popular recently and I will try to fix the issues you addressed.
1. This is extremely weird, The speed up normally just doubles the speed of the game without exceptions, and I just tested it on the sunflower with and without the speed-up with a stopwatch, the sunflower produced sun after 10 seconds with the speed up and 20 seconds without it, which is how it's supposed to be. And also levels are harder with the speed up simply because you don't have as much time to react, not necessarily because sunflowers get nerfed. overall, this is very strange as when I tested it, it worked normally.
2. yeah about that, I currently don't know how to cap the sound but I'll try to figure it out.
3. I guess I'll try to add a volume bar (it'll be easy for the music but might be tough for the sound effects)
4. about the movement speed, I intended for the game to be hard and fast bloons are a part of it, but I thought of an idea to compromise, what if I add a slow-down button to give you time to make quick decisions? some other fangames like pvz fusion have it and it might be helpful here, let me know what you think of this.
I really appreciate your overall feedback, and yeah, it does suck that Altrive didn't get to the minigames because of my game's difficulty, but there will be a difficulty selection which adds an easy and hard mode in the next update, this will make gameplay more flexible for casual players and still offer a bigger challenge for more experienced players.