I realize that the game may be informed by hardware/library limitations, but yeah, a blinking triangle or something (visual novel style!) would be helpful.
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I could add something like that to the game engine used. The game engine is just based on the previous games "zeit" and "Raum" and the idea in "zeit" was to get that 80s feeling: No instructions available and you have to find out what works and what not (and if you still have unlimited phantasy - maybe because you are young or still new to computers - everything seems possible).
The other and maybe contrary idea and advantage today is: the source code is available and I want to encourage the player to take a look at the inner workings.