Thank you so much for playing and for such a detailed feedback! I'm really glad you had a chance to play it fresh without any knowledge before, because this gives me the best insight into first time player experience. Let me comment a bit on your feedback.
1. Control of the gun. This is so far the most room splitting feature. My idea for the game is to make the player position around the enemies, rather than aim at them. This is done so the main focus is on platforming and not "twin-stick shooting". I am sure it takes some time to get used to.
2. Size of obstacles and tight gaps. Definitely agree. I am changing the level design right now. It's a developers being the playtester kind of issue, where all levels were super easy for me :D
3. This is also something I do not really know what to do about. Currently the i-frames are set to about half a second which is already long, but the issue mostly comes from not enough manoeuvrability to get away from the danger. I will come back to this and think of some solutions.
Again, thanks a lot for playing and leaving feedback! If you could send me the link to your YT channel that would be great!