Oh man, this one was awesome!

First off, that aesthetic. Dithered monochrome pixelart, oh my yes! I love the little details in how the slime's mass moves around from rising to falling. The music is perfect for getting me in a puzzle-platforming mood, and the sound effects are minimal, but everything they need to be.

The controls are a little bit rough - you have very little control over your jump, and you need to be extremely precise with when you activate each poison - but the biggest problem, I think, is how little the game explains what everything does.

Or... is that a problem? Because I still managed to beat it, I had a hell of a time doing it, and there was at least one moment when I literally shouted "AW YEAH!" out loud when I figured out the solution to a puzzle. The fact that the game gives you nothing makes it immensely satisfying when you figure everything out.

I had a blast with this one. Great stuff!

Really nice style and solid gameplay. Sadly this is hampered immensely by how punishing it is to learn the new abilities you unlock. I got to the second poison, after which I had to figure out how to walljump using it and the first one together. I managed to get over by spamming the two abilities but filling up your meter sends you back to the last checkpoint, so I was stuck.

I think the game would benefit from slowly introducing challenges after each unlocked ability and then combining them at the end, rather than making it near impossible to get past the first obstacle without fully understanding how to use your skills.

However, I am only critical because I see a very good game here. The art style is unique and the mechanics themselves have the potential to be really solid. 

Good job!