I really enjoyed this one. It's clever and could definitely be expanded.
I did run into an issue where the Inventory and Skill screens were both up, and hitting "Hide" just went to the other one, which effectively ended the game for me. But I liked it enough to retry it and play again! Also, it seems like the prices of the weapons aren't accurate? Not sure what's going on there. (Edit: There's also something about it remembering the credits you have before spending them, and you can spend them multiple times by switching screens?)