You can download the game along with the game manual and a printable NES box from this link to make your very own physical copy.
The core assets of the game are available (under a CC BY-NC-ND license) here.
How to play
This game can be played only with the keyboard, using the following configuration:
- [W][A][S][D] keys
- Directional controls
- [K] key
- A button
- [J] key
- B button
- [Spacebar] key
- Select button
- [Enter] key
- Start button
- [F11]* key
- Enter/exit full-screen mode (depends on the browser settings)
- [F12] key
-  keys
- Lower/raise the music volume, respectively
However, tools like the excellent JoyToKey can be used to map these keys to other controllers, like, a USB NES-like controller!
View the game manual with all the information you may need here.