Hello again.
I started this thing almost a year ago as a passion project when I was out of work. It is full of clever things. I was so proud about all the clever things. It has parallax background scrolling. It stores a bunch of game data RLE-encoded in the spritesheet and as garbage strings in the code. It's doing all this hot-swapping of sprites into the spritesheet as the game needs them.
I haven't worked on it in like 6 months and I don't think I will again, so here it is! You can collect these marshmallowy looking stars and run around in the first "level", which is more like a bunch of test platforms just seeing what could be accomplished. There was supposed to be a cutscene at the start and the sprites still exist in the code for that, but in this version you just get dumped right into the level.
If you edit LEVEL=1 to say LEVEL=2 in the code you'll get an alternate (and very basic) level with different art.
I wanted to write music for it and I figured something out on piano and transcribed it in but it's like the very first revision of it and apologies if it's annoying!
Also here is a debug version where you can "fly" and also go beyond the beginning and end of levels and have random cart data interpreted as platforms. This was one of the most interesting things to me during dev.