This game was really fun. I enjoyed playing it, and think you have a successful idea here. As you said, it might help to have more to it. I also think it would be more natural to have one fire button, and fire in the direction you're facing, but I wouldn't complain about the controls at all - just maybe an alternative scheme to how they could work. I doubt there's anything else I can say that you don't already know - maybe only thing that Node2D now contains the logic for Y-Sort. You can turn that on and in general it makes things work better when you have the player in front of or behind boxes and stuff, makes the correct parts disappear. I think I'd probably also switch to more standard RPG view instead of pure top-down, but that's just me.
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Thanks for the feedback. The control scheme I was going for was similar to Binding of Isaac. I wanted the player to have the ability to move and shoot at the same time so the bullet-hell mechanics wouldn't be too difficult. Only being able to shoot in the direction you are moving seemed like it would be a huge step up in the difficultly.
Yeah the ysort stuff was set properly but not sure why it was still wonky. Some of those nodes were late additions and didn't get as much time to polish as others. For the RPG-view not being top down, I will consider it but I don't have much artistic talent and its just a bit easier for me to manage top down views right now.