Have now managed to finish all levels. Some levels were very tricky
I actually found more bugs during play. The last level also has that bug so you can move blocks into platforms. This is the most important thing to fix.
This is not really a bug. The ending picture says "SUKCES". I first thought this was a misspelling. But checked it out. SUKCES is Polish and means SUCCESS in English. I still, I think it should be SUCCESS because all other text in game is in English.
I actually found more things than this that I think should be fixed.