Hello, the problem is that the last uploaded version of the source code was using Godot 3.5, not 3.5.1, you should try running it in 3.5
If it doesn't work, send me a message in discord (JoacoN#7161) and I will upload a newer version of the source code.
It also could be a problem involving the amount of resources loaded in the first scene, in which case I will need to make an optimisation and organization update.
Hope it helps! Also check out my other games if you want. Waythed 1 is finished, and Waythed 2 will soon go free with an upload of the source code. SCP Texted: Act 1 is finished even if the other acts are cancelled, and you could try goofing around Sancti Insania even if its still in a very early alpha