After playing a bit more I think my problem is with enemies placements, they seems to always be a bit too high or a bit too low making it tedious to shoot them, maybe increasing their hit box would help, the game would be a bit easier but I think the flow would be better (it's only my opinion of course) . Some of them who are flying too low are also unkillable I think, but don't know if it's really a problem, it was probably intended to just be dodged.
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I completely understand what you mean about the hitboxes, and I think I agree as well! The low flying enemies were indeed leant to be jumped over, but I guess the way it is now creates the illusion that you should be able to kill them. I will definitely think about how to deal with that
Thank you so much for your response! This really helps me become a better game maker :D