Well it depends on how you design I suppose. If you like to get a rough version playable then tweak I can imagine that this approach would be good. I playtest every few blocks elements and decide whether I find them fun. If I can't come up with something fun I just stay stuck at that spot or do something else.
I build my levels in what I like to call "Chunks". Right now, i'm trying to build a 9-Chunk Level which can be completed in 120 Seconds Maximum.
I've maybe built 20 "Chunks" today, but only 4 have stuck, which were the first 4 I built, but i've tweaked my Maze Chunk from:
- Stupidly easy that Robin had no problem with that part.
- Stupidly hard in which a part needed crouching.
- Hard in which the crouch part was removed, but other parts seemed too close for comfort.
Now it's sort of much easier to handle, but not as easy as it's first iteration.
Trying to think of 1 last chunk for the day, then i'll think of 2 more tomorrow and Monday and publish it on Tuesday.
Am I annoyed that 16 Chunks i've made today have not been fun? Kind of, but rather I play them and think they are crap than let people play and have a hard time.
I've played enough 100-Mario (like 4 times) to know that levels which aren't fun are annoying. You need to strike a balance, one which many fail to.
EDIT: Realise the maze is the only good part in my level, deleting the other Chunks to make a 9-Maze Level.