There're a lot of level types already published which can be sort in various categories: puzzle, logic, large, small, with Red-B (electric or not), with hidden mechanics, having some known form of objects (like an engine, a locomotive, etc), with known tricks, and more other categories. What do you prefer?
I'll better response with the levels that I don't like: Those based on bugs and those where are hidden draggables.
Aw. Personally I love good levels that utilize a bug (also talking to Mark69). I also hate hidden Draggables, though (like ones that you can't see at all. If they're still peeking out, that's ok).
I like mazes, big mazes. I don't like bugs either. I don't like puzzles that are so unstable that B-bot is always falling off.
I prefer the smaller and not overcomplex puzzles. I don't like puzzles, where you need to fulfill lots of mobilityskills and trainingtimes and near the end you find the most hardest challenge and get kicked out and need to start again the frustrating tour. I'm always happy with clever constructed cards, where the point is, to find the way and not to do sport