Correct! There are a couple of ways to get the game on hardware.
- One method I use is an EZ-Flash JR. There is also the Everdrive GB X3.
- With a cart reader/writer (https://shop.insidegadgets.com/product/gbxcart-rw/) and rewritable cart: https://shop.insidegadgets.com/product/gameboy-2mb-32kb-fram-flash-cart-ultra-lo...
- It works on handheld emulators too. I have an Anbernic. There is also Chromatic and Analogue Pocket, but I don't have either of those to test on. There is also FPGA emulation, which I'm not too familiar with.
If you wanted to play on PC
- You can use emulation. I recommend https://mgba.io/ (Quickest way)
- If I ever figure out how to package into exe, that could be an option too.