Nice idea for a small turn based game. I haven’t beat it yet but I replayed several times. Everything so far looks and feels great, I look forward to seeing more development.
My only feedback is that upgrading defenses seemed a little under-powered. I kept wishing I could decrease the cooldown some. I had more success with many low-level defenses than I did with a few high-level defenses.
I noticed a bug with the health restore. After using it once, the menu displays “out of order” however you can still purchase the health. You can even purchase it at full health- but it takes 2 coins/credits instead of 1.