Just put them in spoiler tags and it's fine, at least for me. Also, I noticed that there are some inconsistencies with the style of the tiles you are using. My suggestion is to be carefully chosen so they have similar styles each other. For example, some of the tiles is borderless while some has borders. So, try to edit them, if you feel want to.
Well, having a progress report will help people to get the idea the progress of the game and building the hype, but that's not a priority for me. Plus, progress report can be an additional pressure sometimes. The good thing about a progress report is that you can tease your audience with the percentage, which add more live to the thread XD
Tbh the reason I prefer games with episodes to one full game is because it's nice to see the development of the game from their early stage, then the old content get new update together with new stories. Seeing the developer grows their skill as more episodes progress is one of the reason I prefer fan-games to official ones. This is apparent with Reborn and Rejuvenation. But again, the decision is yours. This game will be different from any fan-game either, so no matter how long it takes it'll be awesome, I'm sure.