I started to play it and definetly has a unique approach. I'm really enjoying it especially the musical number. Still yet to complete it though. On a side I thought initially it was made in Unity till I went through the game files. You built the engine from the ground up? I'm truly impressed.
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I used Tyranobuilder it's a Visual Novel engine but it's really good for FMV my first few games it's been really good for although you can do a bit more with Unity. I've done 4 projects using it but i am now trying to get my head around Unity as I have a few more ambitious ideas for my next couple of projects.