Hey! I like  Mosi more than Bitsy:
1) More easy and clear interface than Bitsy
2) More advanced script (in Bitsy I can't  teleport avatar  or delete tile without plugins)
3) I like world settings: colors,sprite size, world size

But there's some no good things:
1) No community :<
2) No documentation (just randomly I found a way how to move map location to other sector, by mouse dragging)
3) No example games for start
4) Avatar moving is very slow, I don't like that speed feeling. (There's need speed setting for avatar in world settings.)