So this is a cool idea but I'm having some difficulty being able to play it. Specifically it's these prohibited signs -- a necessary addition because the first thing I thought to do was scoop up the blob in a box on 3 sides to control it directly, but the signs prevent you from continuing. However, the signs also are solid and tangible to the blob, so it can't pass through them, which is most annoying at the first checkpoint where there's one right in front of you.
I kind of gave up because of that and the fact that it's pretty buggy -- blocks will move if you die and were holding the WASD, things jitter, objects can phase through each other, etc.
That being said, I do plan on coming back to this game later and playing it fully, just right now this is my first game on a quest to play all the games tagged "Metroidvania" in the GMTK jam and I'm not in the mood for frustration.