For the first paragraph, yeah... I'm not a good puzzle designer at all... I just kinda threw out some platforms here and there, if they were fun, I keep them, else I delete... I guess now you can see why the level design is bad.
For the second paragraph, you're right... Z and LMB aren't really the most comfortable controls. I just figured having both arrows/z and wasd/lmb would make it more accessible but after the jam ended I realized it was a a bit bad.
And for the third paragraph, I just liked it to be a surprise what the action button does. I didn't want to show what the whole game is about BEFORE the player begins playing, so I did that. Apparently most people who play tested it didn't agree but I kept it there anyway.
But anyway, thank you for playing! It's nice to know that some people actually didn't get bored after the first/second level. Thank you for playing!