Fun little premise. I like to imagine joining the blob squad is involuntary. It makes me chuckle. The core concept is solid - change your shape/abilities by picking up animals so you can navigate different parts. However, the controls need more tuning. The extreme sliding and incredibly small jump on the base slime don't feel good at all. I died a lot on the frog level even just trying to get to the frog. And losing control once grabbing it made it very difficult to continue. Unless the theme is specifically "out of control", it's usually better to let the player have control over their movement.
There's a lot of potential here, but I couldn't get past a few levels due to difficulty.
Overall, well done! I can tell there's a lot more here than I saw (probably). Impressive for 48 hours. Congrats!