Finished the demo. The mechanism of adsorption on the ceiling is unique (seems to be achieved by providing continuous upward speed). The demo made me learn this mechanism gradually through a series of levels, which is very rewarding and interesting. Story is fun.
On the other hand, I couldn't quite get used to jump by pressing up arrow. A customize keyboard settings is recommended.
It seems that the height of jump can't be controlled. Is it designed deliberately?
I didn't realize that mouse can be used to interact with npc until sun block. Maybe the function of mouse can be introduced in HELP or tortle dialog.
The map is a bit blurry and I can't see the words clearly.