Unfortunately this seems to like to hard-crash on loads between floors pretty often, at least on the PC I’m playing from. Happened on the first couple levels in Firefox. I did try the download version too, and it crashed again, though not until I reached Floor 7.
But I do like this kind of game, and it’s very cute! I liked the choice of upgrades system. As far as balance/difficulty, I seemed to be taking it pretty easy just picking the ones with more ticks on the icons each time and figuring it would probably not steer me too wrong.
Needs some optimization mainly. I have my doubts that a game of this size should need load screens at all.