Brightened my day :)
You're right, it has a lot of character. I love the slimy bob that somehow hovers. The party mode was fun to find and the goofy party blower sound that played made me smile. I think I found all secrets, but I'm not sure, as I couldn't figure out how to reach some of the magic posters.
The UI worked well and it felt like it belonged in the game world.
As I think you know, it's a shame that there aren't any real puzzles in the game, aside from that one secret room. All of the levels feel like they are just supposed to be your first introduction to a new mechanic that you couldn't possibly mess up and there is barely any thought required to solve them. I think I would have enjoyed playing more levels with challenging puzzles.
It's a goofy game and I can see why you love it so much. I was going to give you a buck or two for it, but unfortunately you don't have pay-what-you-want enabled. Thanks for sharing Hoverslug with me.