Well, I'm getting pretty close to finishing my first little GMHTML5 project. The final game will have 2 long "rounds" each consisting of 50 enemy waves and a boss battle. Clearing both rounds gives you an ending screen, naturally; but will also loop the game, setting the enemies' firing rate (and other adjustments) to their maximum from the start.
I'm planning on posting the HTML5 version wherever I can (feel free to recommend places) and I'm thinking about offering the surprisingly smoother and faster Windows EXE version for a buck or two as well. Speaking of that, whenever the premium edition of XYX is ready, the EXE version of Megatank will be included on the disc as a bonus. I'll probably have to dedicate part of the manual to it now, though. ;)