Pretty well made overall (gameplay, art, music), with a few readability issues imo : the text is too small, even on fullscreen (I played in browser), and the shadows casted by the walls feel too opaque : in other games in this genre you can see the difference between walls and shadows, it's not the case in your game and it gave me a weird feeling of claustrophobia.
Here's an example of text that's too small :
This is an extreme example because the game is not full-screen, but even when full-screen, the text is still flattened for some reason, and the upgrade description text is squished in the other direction, which is quite jarring.
While replaying, I heard that there are sound effects for information that I did not notice before, it's a nice touch.