Does this developer even have the rights to use intelectual property of the original author?

These video games rarely have Dutch subtitles

I just entered the area under the castle and found the glowing mushroom and put into the lantern. Then I enter the room on the left to connect the three lights. I did that and the room is lit, but everything is still not working in the room and I always get the message that there is to dark in the room. I have turned on the lights. I for example can't pick up the jack hammer or check anything in this room. Just like it was before I turned the lights on. I am using Ubuntu 14.04 64 bit....

I played the game and got all achievements except the expert mode. I want to replay in expert, but the game won't start over.

This works perfectly on Steam Deck, straight out of the box. Just an FYI :)