GAMEPLAY: No menu, no nothing, just straight into it. Having a basic description on the bottom is handy, but do make sure it's correct (I notice the note about triangles changing incoming shapes). I thought the strategy seemed basic until I realized squares drain points as well (could also use a tip on that). It's too late tonight for me to piece together a proper strategy, but it seems like there's one, and I'll take that. I'll agree with everyone here, it took a while to intentionally lose because of the spawn rate of octagons. They might be a problem entirely, though I'm not sure what to replace them with.
VISUALS: Cohesive and clean, and basic graphics works well for abstract strategy. Anti-aliasing on the shapes would help smooth things out (man it sound stupid when I say it like that).
AUDIO: This is waaaay too hardcore of music for something adjacent to 2048. The bashes on clicking shapes are maybe also too hardcore, but I wasn't upset about that one.
THEME: Just because a game is very limited doesn't mean it feels like 'everything' gets used. It does empirically, but I just don't get the sense of it.