I tihnk this was a cool idea. I would've liked to put this game on full screen and there was slow down a bit on the web version. I don't know if you had a downloaded version. But I think that's a limitation with web. We also had framerate issues on our game as well.
I would've liked if the game was a bit more active, it was fun for a little just walking around collecting stuff, but I didn't really feel any of the upgrades beyond the game lasting longer between my two playthroughs.
Also, I noticed that the game eventually just kept giving me firerate upgrades and nothing else, not sure if this was a design decision or bug, but it felt like it took away the one piece of input I was contributing. Made me kinda sad :(. But it was fun :)