Sorry but I have not yet been able to replicate the error.
I uploaded another small fix (v0.9.2) to change the animation of the start screen and see if the problem was the animation or something about the engine itself.
Also, one possible solution could be turning off the antialiasing of the graphic card (Nvidia control panel > Manage 3D settings > turn Antialiasing - mode to OFF) or updating the drivers and setting to default values.
Interesting thing, problem still exists on system with Nvidia, but now demo runs on Celeron N3350 (I always tested on both systems, hoping it would work on Celeron). Works not bad, FPS drops in animated scenes, but still playable.
I tried settings in Nvidia panel, but sadly it didn't help. Maybe problem is really in drivers, but I haven't been able to find newer ones yet. Anyway, at least I have a system on which I can test next builds, so I think I'll join your Patreon to try public version. I will continue to try builds on both systems, maybe problem will solve itself
