Balancing the game economy is hard, but for now I'd like to keep it roughly where it is now. I prefer the situation where the player cannot over-buy things incl. equipment. The game does give you a lot of free nuggets and coffee, even if some of them can be a bit hidden. Plus the game isn't that hard at this point and I myself have had little need to buy healing items on my test playthroughs.
There will be a healer character in v2 which lessens the importance of healing items further, and monsters will also drop more money as the game progresses.