The lottery game was developed in a couple of days. The battleship game is something I had kicking around from like 3 years ago funnily enough. I had a bit of the logic in there that I didn't even need to change, it just worked. But there was no UI, so I've been hacking away at the UI for about 2.5 weeks on and off (the lottery app was a distraction to stop me going crazy).
Funnily enough, the lottery game just uses code I copied from the battleship game, but made to apply to the lottery game (which just streams the blockchain and looks for specific values to capture for processing).
I'm actually working on the invitation mechanics now, but it's on a separate branch to the current stuff as I was going to make everything use web components at one point and sidelined some things.