Glad I could help to some extent haha - the game is definitely playable and fun as is, and as for the difficultly, I might just be bad at it! I tend to favor slower paced games haha, and even I felt like the difficulty here was still pretty reasonable.
I'll try to keep following this, cause it seems really cool and I'd love to see where you take it from here! It definitely sounds like you have cool plans ahead. Happy developing! :]