Thank you,
I tried hard to get the feel right. There were a couple things like the speed of movement that were limited due to the character limit, but I'm glad to hear the positive feedback on the core mechanics. I'm thinking about making a deluxe version with no size limitation sometime, if I can add some other unique feature, as well as some kind of music.
You're welcome for the sprite routines, I'm glad to see people using those. I'm currently working on pushing things further and making a system that can handle full-blown level graphics in a very small space. Hope to have something done to show that off by the end of the jam.