An update, how nice. Slow Mole Jr. is one of my favourite homebrew games on NES! And now you've made a Pico8 version I will definitly check them out really soon. Feels like a good platform for the game.
Thanks! Actually, the Pico-8 version came first. The NES version is nearly a 1:1 conversion, but with three more screens (including the end screen). I wrote a blog post about how I ported it: https://ko-fi.com/post/Porting-my-Pico-8-game-to-the-NES-F2F7193LW4