What engine are touch/feel games created in?

[namename555]

I am curious as to which game engine touch/feel games are created in.

Below are a few examples of the games I'm talking about:

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[TheBlueKnight]

Unity, Unity and Wolf for the PC version RPGM MV for the Android one. Old ones may be Flash.

Edit - Hold on I'm confusing Utouto with the several extremely similar games since... Tyrano I think.