Thanks for the detailed feedback, this is extremely useful. Yeah, that mechanic isn't well explained, I need to at least add a custom animation and see if it helps.
This game was made during a weekend for a game jam, the theme was related to have only one, so I the idea is to hit all obstacles With a single bullet. But if I develop it further it won't need this restriction anymore, so we could have "puzzles" that require multiple shots in different parts within a time frame, which could be fun. I would also make use of the super slow motion inherited mechanic to add some cool vfx like wobbling sructures upon impact, rain and breakable structures.
Regarding the levels, I would like to add a story element to it, and make the current levels just some training sections to introduce new mechanics between the actual missions a la "The Wanted" movie. The missions could be assassinations that happens in unlikely places and that make use of the fact that you can curve the bullet, but you would still just control the aim of the character, and it would happen in a small and predefined scene+setting.
But this may be a bit of a overscope, so I'm thinking about other alternatives for this game that don't increase the scope this much.