Thank you for the feedback! I am working on weapon-specific progression and upgrades which includes larger hitboxes for easier clicking. In terms of contrast, I see what you mean. I tried to keep the color scheme to 4 colors like the Game Boy, as I'm not much of an artist so only having 4 colors to work with actually helps me when making the assets. I will take what you said into consideration and see what I can do.
Ooh, an upgrade for easier clicking is a great idea!
I do like the color scheme, and most of your in-game elements work great, like the frames on the wall outlining the weapons, it makes them seem important. The biggest thing I had an issue with was the tabs on the right, I didn't even notice them until after a few minutes of playing. maybe making them bigger would fix it, I'm not sure.