This is a nice concept and well-executed.

I don't have the space-scrolling issue, maybe it's browser-specific (chrome for me). But it's very possible that it was indeed just a focus issue.

The game would benefit from:
- Some save function or checkpoint, so I can close it and resume later (the 'quit' option doesn't do anything?)
- Additional music tracks for variation

Some smaller issues I found:
- When I press S to move down in the menu, the slime splats as well
- Can't see slime meter outline when background is black
- It often ignores my 'W' keystroke. I think it's because my crappy hardware causes a mediocre framerate, and my W press is quicker than a frame.

I just mention these things to help, they don't detract much from the game.

The best part of this is how the graphics succesfully convey the feeling that it splotches everywhere.

nice little game to roam around in
music is a lil loud

Fun and pretty, but really frustrating, especially when I the game bugged, and I got stuck. It happens when you grapple and shoot slime. Then you run out of slime, but grapple doesn't detach and you can't jump, can't fall down, the only thing left to do, is hanging on the grappling rope.

Also, the controls aren't very comfortable, I'd prefer if grappling used some other key, cause many platformers use both W and Space for jumping, and my muscle memory gets confused.

wow. this is polished as all hell! this game seems really friggin cool and I think i'll come back! great job, op!