Ah, actually the umbrella stage was designed so that blue stays at the bottom (harder), but I thought if people wanna cheese it it's okay. I might change it.
Ohh okay so maybe just change the timing of the saws a bit, I see. :P
For a challenge mode, I thought I might add extra collectibles that are hard to reach in some levels just for the achievement, but I'm not sure yet. I'll focus on just making more levels ^_^
Thanks for the feedback! When the game becomes longer the later levels will be harder also ^_^