My main gripe is that bombs take too long to explode and make using them to jump and kill enemies in tight spots frustrating, also the charge beam doesn't feel satisfying to use because it's so difficult to hit anything with it.
You'll be happy to hear that the next demo fixes for both of these issues.
The bombs have quiet a few quality of life changes in the form of bomb jump assists that make bomb jumping and morph jumping in general feel a lot more natural and intended rather than the game punishing you for not being pixel perfect.
All the beam and missile hitboxes have had their size increased as well, making it easier to hit enemies. The Splitter Beam also moves beams farther apart, making it even easier to hit enemies.