"Retro Game Aliens" is developed using "Tyrano Script"(as a reminder, this is not a misspelling!).
Tyrano Script is a free game engine developed by a Japanese freelance engineer.
It is not suitable for the action game development environment. However, it is perfect for developing visual novels like "Retro Game Aliens."

For example, to display the background CG stored in a specific folder, write the following script in the scenario file (.ks).

As a result, the image data "sample.png" will be displayed as a fade-in at a speed of 1000 milliseconds ( = 1 second ) .
There are several methods available for the image switching effect. By adding the "method" parameter to the above script and specifying the method name to use, effects other than the default setting "Fade in" can be used.
Furthermore, by adding the parameter (true/false) of "wait", it is possible to set whether to wait or ignore the completion of display processing.
By adding the "cross" parameter (true/false), it is possible to specify whether or not to apply the effect of the same method to the already displayed background CG.

From this explanation alone, you can see how the structure of Tyrano Script is the "minimum necessary" for making a visual novel. It is also a big attraction that the output of the build is compatible with multiple platforms including smartphones ( iOS / Android) .

However, for me, the act of writing a script was a pain for me before (it does not mean that the act became pleasant now...).
The software that strongly supported me was the "Tirano Builder", which creates a scenario by graphically arranging the componentized tyrannoscript functions.

Tyrano Builder has a free version with some limited functions and a paid version with all functions.

The software basically supports only Japanese, but the paid version sold on Steam also supports display in English.

Tyrano Builder has taught me that a middle-aged gamer lacking in diligence can create a video game that many people can play and watch Game live video. If you have tried all kinds of game making methods in the past and have not been able to complete them, please use this software as the "last challenge"!

Tyrano Builder is a wonderful software that always keeps up with the demands of beginners in visual novel development. However, the componentized functionality is more limited.

To implement a little more elaborate presentation in your game, you need to write Tyrano Script tags or Javascript directly.
I stopped using Tyrano Builder when I realized that those descriptions occupied the majority of the scenario viewer.

I'm still annoying and careless, but I'm still motivated by the recently released Tyrano Script-based software for game development support, "Tyrano Studio" ( This software is also available in free and paid versions.) .

First of all, I plan to get used to the new development environment by developing the English version of the short visual novel "Dad's PC Quest" that I made in the past!

*The following is an aside.

The developers of Tyrano Script provide various services using the same game engine.

Many of the UIs are only available in Japanese. However, it is also true that there are many attractive services such as "TRPG Studio" where you can experience an interactive role-playing game using dice as a real-time session in the form of a visual novel.

STRIKEWORKS official website