Not the prettiest game, but probably the most enjoyable I've played in the jam so far. Something about these games where you outcompete everything around you and slurp them up through a swizzle straw just feels really satisfying. There's not much challenge (so long as you prioritize offense and don't grow too big too fast) but I'm happy to see a game that realizes that driving the premise is more important than challenge in a jam game.
Though of course, any game based around "scale" invites potential problems of optimization. I decided to hang out around 38" height and try to pump up my upgrades as much as possible -- the game eventually slowed to a crawl. The only thing that should have been increasing load at that point would be the increased bullet count, but the slowdown persisted even when not firing and no enemies on screen. Could be drawing all those vines and spores and particles is just too much, or could be there's a memory leak somewhere. I played the .exe, not sure how the browser version performs. Something to keep in mind if you decide to expand the idea in the future.
All in all, I'm glad Mark showcased it. It's a very yummy game, and of all the games he's streamed so far, this was the first that made me want to go install it myself.