Rewritten the renderer in OpenGL, the game now runs with under 20 draw calls and less than 1 mb data buffered to GPU. reduced used RAM by around 600mb by placing all sprites into one texture and sending it to VRAM, the entire game sprite pixel data and font atlasses are on one giant texture stored in the GPU, used VRAM ~ 300 mb. (you can see debug info on the left, gif is low FPS and has artifacts, the thing runs at 60 with no problems).
The "Render layers" is a system that solves alpha blending problems as it is order dependent. The renderer splits the 2d space into layers so that those at the bottom get rendered first and translucent objects blend correctly. This still doesn't produce that many draw calls as you can see below.
Looks the same as before, just runs better with more control + shaders!