ok, so I officially found the secretest secret.
Decent variety, nice backgrounds, level design is close to a death traps in Meatboy style, but plenty of checkpoints ease dangerous situations. Blorb being just a defenseless ball offers no real variety. Health pickups or powerups would be a nice addition, if only blorb decided to fight back.
The real mechanic here are trampolines. There's so much of it I felt overwhelmed by the last level. For me that's showing you need additional ideas to make your adventure fresh.
Interactions with signs and finding secret coins was nice.
Overall not bad for a first attempt. Blorb 2 needs new ideas though to make it worthwhile.