I cant finish level 28 I tried everything but it wont work. Level 29 & 30 I finished right away.

Should achievement work now or sometimes later? Because it is not working yet and there has been no info about it.

I've done all levels now 2 times, and still no achievement. Do I need to play through all levels at once? If that's so: please fix level 28!

I quite like the idea behind this game because it's finally a digital version of what used to be in those children's puzzle books when I was growing up. But did I see that right that some levels are entirely invisible? That seems quite a bit off-putting to me considering there aren't many levels to begin with :( As you can see, I'm not a big fan of Revomaze-variety as others probably are. How many levels are affected by this? The description didn't even mention it and I only found out because I watched t...

Will you be able to control the dot via mouse, or is this game strictly controlled by keyboard?