The post-jam updates (1.0.1 and 1.0.2) addressed most of the issues I was aware of, so if you see more I'm absolutely interested in that extended feedback!
For the aiming, can I ask which version you played? Aiming up was introduced 2 days ago in version 1.0.2. Did you have that during your playthrough? My hope was that aiming-up + the Spreadshot upgrade would cover most of the space.
I'm still hesitant to add diagonal aiming, either only when you're moving (instead of keeping straight up) or with an extra button press. It would complicate the controls (especially on a keyboard) and require a lot of extra animations, so I'm on the fence. Full-freedom cursor-aiming is something I'm pretty sure I won't do, though. It would require either 3D or procedural animations and force players to stop while they're aiming.