Understandable. It does indeed take quite a while to make a game's foundation. Take mine for example - I have been developing it for over a year and a half, and can finally say, most of the systems needed are in place. Take your time to make the base stronger, as it gets quite hard to maintain otherwise!
Game loop is something that will need to be built inevitably, thus I suggest to build systems around the ground gameplay idea, before finally implementing it.
Thank you for liking my game, and I am happy to hear you got inspiration from it!
I hope to see more of this game as is quite promising! Good luck in your game dev journey!