I like the idea of this, and I enjoy how hectic it can be. Having to balance your resource spending between two fronts is a fun concept!
A few things that I think might improve the gameplay:
- I found it a bit awkward to fire and move with my left hand, if the external guns fired automatically it'd be a lot easier to control (or even toggle fire, if there's ever a reason to not fire your turrets).
- It's quite hard to keep track of what's going on outside and what's going on inside, which I'm fine with being a challenge, BUT then the UI is at the edges of the screen so you end up looking at health which I feel makes more difficult. Having a healbar on your core, and maybe even the coin count on your ship might be nicer.