first I want to say that Maratis can be a really great engine, but currently it lacks in some important things that I list below:
1.First of all Maratis needs an easy way to create new objects beside the editor, I mean how should I create for example a lot of enemies that comes in waves while the game is running ? I mean placing every enemy in the editor just cost ram and it don't allow specific things.
2.A scenegraph, because as far I can tell Maratis use only frustum culling ? This reduce the gpu a little, but it will still render objects that are behind a wall etc. so it need occlusion culling to render larger scenes.
3.A propered way of collision detection, because in the current way I need to check for every object if it collide with another one, but that shouldn't be necessary since Bullet already makes collision checks in order to avoid intersections with them, so it would be great if the game class get an collision callback so I can grab the desired collision out of this function.
Ps: I used Maratis a while ago so maybe some of these things are already done 
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