Those are just "their" opinions, so don't feel bad for not meeting "their" needs. However, I agrees with them that an option to skip robot master dialogues is needed, which is crucial for speedrunners.
This game is difficult in some parts, but not as "unbalanced" as they said. The only concern is Dual W Fortress 1 where the winds and terrain are quite frustrating even with utilities, if to nerf the difficulty, it's the only stage which needs.
Music is your musicians' masterpiece, there is no objective definition of "catchy", and I found no point to complain. My favorite is Virus Fortress 3, and I hope an interface to play ingame BGM (e.g. sound test, Idol Woman in MAGMML3) will come soon.