Little progress I've made
I tried Magellan, a TI 99/4a map editor.
It seem fine to me but I can't import my tiles from ICVGM.
Maybe I will use it for future projects.
I found threads with tilestudio mentioned I can't find the link to download.
I spent two days to figure how to use sound. Most of time, sound is played a too late.
I also managed to fix a bug with scrolling. Sometimes, the player does not follow the background when it's scrolling.
Still not decide with the next room.
That's all for today.