This is quite a fun litle puzzle game! Blobs interactions are well polished. The sound effects are also very cute and has different tones when the blobs interact. The game lacks a background music playing (the only needed improvement that I can point of), but it doesn't feel like it need one anyway. The flow of the puzzle (ramping difficulty and variety), visual polish, and sound effects are enough to engage me through all the levels.
I am not a big puzzle gamer, and I find the controls and rules very intuitive, so good job on the on-boarding. Overall, I completed all the demo levels in under 30 min. I didn't get stuck per se, but spent an embarrassingly long time on the second last level of the reef.
Regarding on the feelings that I get from interacting with the blobs... I can only describe what I felt while playing. Please don't take it as any suggestion to change.
It's weird... some of the blobs give me some eerie feelings. They look cute and repulsive at the same time. The ones I find cute are those in The Common (the angry/happy levels). For the repulsive ones, it is The Reef level blobs where they have appendages around them. They definitely feel like virus or one-celled-bacteria trying to eat each other. Those are more on the repulsive side than cute. I was also taken aback when presented with the three-eyed blobs near the start of the game. If this eerie feeling between cute/repulsive is what you're aiming for, you did a pretty good job.
Overall, this is a good little puzzle game! It scratches the simple problem-solving itch while also eliciting some emotions. I would definitely see these kinds of games being played inside a commuter train or waiting for your turn at the dentist' office. Good job!