Welcome here! This is just the start of this forum, so get ready to post some ideas!

welcome new people

For example, y'all can make smooth movement with this:

when green flag clicked
forever
change x by (( (mouse x)  - (x position) /  ((Smoothness) :: operation block #90EE87
end 

how to make your sprite follow your mouse:

when green flag clicked
forever
point in direction (mouse pointer v)
move (10) steps
end

Platformer games that have an interesting twist to it. Not completely impossible and maybe some hard-to-find solutions, but something to make it a unique platformer.