Just a quick question purely out of interest.
The resolution you went with is 240x136, I was wondering why you chose 136 rather than 135 for a true 16:9 ratio which would be 1920x1080/8?
Is this purely down to being able to fit the tile maps 8x8 on the screen without losing a line of pixels?
I'm assuming in full screen mode it would just display the bottom row of true pixels in 8x7?!
Were you tempted to go to 256x144 for a 16:9 and divisable by 8 choice? Or even a ratio like 4:3 or 5:4.
Sorry if they seem like irrelevant questions, I just have curiosities on inspired choices made and what ideas you toyed with.
Anyway please keep up the great work, I hope you consider increasing the size limit of the cart to allow creations to be a little more ambitious, I like the idea of restrictions but I'm a bit put off by the idea that a full 8 bit demake or port is pretty much out the question for anything of significant content (Mario 3 with a save feature is always my imaginary rule of thumb for 8 bit).
And even if you felt like being extra generous with the limits...well...
(240x136 using pico-8 palette)