You were originally going to be able to suck up the Time Monsters?!!
He also sucks up tom toms with his vacuum in the concept art. But I guess that makes it too similar to Luigi's mansion.
The gameplay of Blinx actually reminds me a lot of Kirby, where your main method of attack is also to suck stuff up and spit it out at enemies, except in Kirby you could suck up smaller enemies as well. In fact, the Blinx games are pretty much the closest things to 3D Kirby games that currently exist.