I feel ridiculous even needing to ask this, but I'm getting desperate. 

I've refined the web version almost as far as I can. The windows build needs the play-testing and feedback the web version got. But most of all, I'm literally improving the downloadable in ways that would increase the file size of the web version to an unreasonable degree.

So I added a rotating ad for the downloadable version of my game to the title screen of the web version of my game.

Is it allowed to do this? Is it a bad idea? Do you suppose it will work? Is it a bad look? It's definitely not a misleading ad. I'm just telling them what I had to cut to make the web version sustainable. (So far, it's closeups of the ships, mip-maps, transparencies and effects that use a lot of fill-rate, that sort of thing.)

I have no idea what I'm supposed to be doing. I just know that what I've been doing so far isn't sustainable indefinitely. 

A game like this needs a demo with twice as much content for a game with like ten times this much content. If I pack it all into the web version, players will churn out before it loads. If I just add it to the downloadable version, not the web version, but I don't say anything about it in places where people are already looking, they won't know that half the demo is missing.

What would you do?