Cool game man! I was kinda hoping for a boss battle at the last part, but you did mention this is a beta.
Same criticisms as everyone else:
keys - I think using up and space would be good for the jump too.
platforms - some of the background/non-interactive stuff is almost indistinguishable from the objects/interactive stuff. (maybe add more obvious contrast? brightness, colors, patterns, idk)
enemies - when you're walking and using the vacuum to suck up the enemy, if they're walking away from you, you'll get hit.
I felt the very end of the demo was the most interesting part for me. (a love interest? a main villain?)
I'm hoping you'll include some back story in the intro/title screen. (i'd kinda assume so)
Anyway, good job, I'd like to see how this turns out!
:handthumbsupR: