I looked at the demo version and it works fine for me with MX-15 Debian Jessie 32 bit. 
The differentiation of the blue tones is somewhat difficult.
Since I play the game in German:
Züge and not Zügen
The level on the picture can of course (?) be completed with the 3 available bricks.
How can the game come to me if I do not use online banking.
I buy games from GOG using Paysafecard.
Hei! Vielen Dank for your comment and your suggestions.
The given level can be surely completed with the 3 coming bricks. Every time bricks are generated randomly (more or less) so often times you complete it with less moves.
Couldn't you add a bit details on your issues with color differentiation? The color of bricks doesn't mean a lot. And the "charge" of light-bulbs is differentiated by color, brightnes AND shape so there where no reports on that part yet. But I could miss something, too :)
As for banking part: since you are the first person who actually expressed his wish to purchase the game (and since I do not know much about payment options) I guess I could just give you Lumini Zen as a Welcome Gift :) If that is ok I'll add a (free) Download Key for your account here on itch.io. Please let me know.
Then others come and want a free download key as well. I would be delighted if you would send me the game or add a Download Key for my account. But I can also pay for it. Can you do something with a paysafecard code or do you want to give me bank details to which I can transfer money?
The problem for me in the game was that after a few levels it was difficult to distinguish which slots were occupied and which were not. Especially if you want to play fast, the differentiation of the blue tones could be clearer. This refers only to the first levels of the demo version.
I have received it.
Thanks, but...
First of all I had to mark the program file as an executable file for a game. Then I had to delete the .local/share/godot/app_userdata/Lumini Zen directory created by the demo version, otherwise the application will think I'm still playing the demo version. There doesn't seem to be an exit button in the game. Since I prefer to play in full-screen mode, I first switch back to windowed mode and then close the window. I don't think that's normal! The game doesn't make me as happy as I hoped, but it's not bad by any means. From about level 20, I notice a kind of disinterest. I was about to quit the game. I felt like it was always the same. It is quite conceivable for me that many demo version players lose their interest in the game at this point. Now I'm in level 27. And on the one hand I have the feeling that the game is too difficult and on the other hand that it is pure coincidence whether you make it through a level or not.
This is my third attempt...
And it won't work again!
I've already gotten used to the not really good distinguishability of the Color shades. But I also noticed that with yellow, not only with blue.
Let's see if I continue the game tomorrow...
>sometimes you have to turn off a cell or two to make one of the next bricks fit.
Do you really think that someone can get to level 27 in your game if they don't know that?
I only managed level 27 on the 8th try. This is frustrating for me. Before I managed more than 20 levels on the first try. Now I am in level 29 and failed on third try. The attempt in the image cannot be completed successfully.
The game shows 3 bricks but I can only take two of them. It's incredibly frustrating when you see the brick that could solve the level but you can't use it. The game is too hard and the random factor is too big. The game should provide one more brick. Especially in the Easy (Leicht) difficulty level.
I can understand what you feel. But this is a puzzle game and it's not supposed to be an easy game.
I've completed every level like dozens times while testing it and it's quite manageable. You just need a solid tactics and a (little) bit of luck.
Here is two more advices:
1. Keep all your umsolved cells together in the final stage of a level. You have one cell in the left-middle part of the field and three cells in the lower-left part on your screenshot. Try to keep it together. That will give you more options to combine bricks.
2. Try to finish a level in the most massive area of the field - I mean some area with less gaps or blocking cells. This will give you more options to place bricks, too.
Good luck!
