Thanks for playing! About the screen - Honestly I don't know. I've made it bigger.
- I've made some changes on the coin and item drops, they should be better now;
- Hold e if you want to skip shop early and use the mouse wheel to zoom in / out;
- Full-screen was an option on the menu but now there's the button on the frame also;
- Slow down makes you walk slower;
Again, thanks for playing and thanks for the feedback!