I didn't make my engine but I used OpenGL
And the days were busy so I did that in 3 days only. Yes NGL 3 days. but still, it was fun and I learned many things about how to organize stuff and what not to do.
What do I mean by not to do? Go to #jam-questions in which I am begging Acerola lol.
By the way, you can play my game but have the same problem (but it can work. depends on the GPU) like the two who rated my game, so see my question. and help me make him kind lol.