After reading comments of others, I decided to give another try to overcome difficulties of the first locations. I managed to acquire the sonic blast. So, I see it's just too hard for me. Enemies are very strong, it's easier to run or jump away than try to kill them all. And in some places platforms are a bit too far from each other and it requires a lot of retries to just jump up. Previously I wrote jumps are floaty, I think that's not exact description why I feel jumps somewhat off. I just try hard many times to jump right in the right moment to have inertia in the next platform throwing me down again. And only now I noticed that jump height depends on horizontal running speed, for me personally it seems unnecessary inconvenience here.