Alright, here's some unsolicited play test feedback. I love the game, but here are some suggestions: :-)
The "reveal all secrets" upgrade is great, but it can lock you out of completing some levels. For instance, the opals in Melon cannot be grabbed anymore. It should be possible to turn this ability off.
Maybe related to that(?): it's literally impossible to grab the blue key in Zurich. This is quite annoying, since it was really hard to already get to that point.
Why are there lives? The only thing it does is forcing you to go through a few more screens to retry, once you're out of lives, which is slightly annoying. It doesn't seem to add anything to the game.
At the start of the game, the fact that pushing sometimes doesn't work at all feels like an annoying bug. Now I know that this is solved soon enough, but still, it might turn players off of the game. Maybe make the push always work, but with some delay?
Why are there no level names in Wonderland? I miss that. There are some great levels, but without names they're forgettable.
The first level in Wonderland is quite hard, it required quite some planning and practice. On the other hand, I passed the levels after it in one attempt. I'm not sure if this is great, since this one hard level locks you out of the whole world. (The same holds for Melon by the way, which is also quite hard.)
The alt key for placing bombs is weird. I would suggest X or Z.
Cube is too big! Exploring it fully takes hours, even when making a map and almost never making a mistake, because there are so many doors that lead back to the start, and you only know when you go through them. I would suggest keeping the same amount of rooms, but removing some of these useless doors: some rooms should only have two exits.
Maybe this is just me, but I find the sound of many gem drops annoying. They use musical scale tones, but I believe they are chromatic (half tones), not from a scale like a major scale, and the melodies they make certainly don't end at the root note. I would suggest sticking to major scale tones (which should be easy), and if possible, always end on the root note (though I realize this is hard to program). This way, they will generate pleasant melodies.
I still cannot finish Ghost in the Shell... Maybe I'm missing something, but even 150s seems very tight.
Why is New York twice in the list of levels?
There are many great levels, but here are the ones I loved the most, despite taking quite a few attempts:
-Weir
-Atlantis
-Great Hall
-Five (though it is really hard!)
-Beijing
-1010
-Swarm
