Yeah LMMS is super awesome, i even did the game's SE with the included sfxr vst.
Could be it, cause i don't really know how to make jump buffering yet, so its always a max height jump no matter how long you press the button, and coyote jump i had some tries from pre jam experiments but i didn't manage to make it right so i went simple jump instead.
But hey now i know what i should work on to improve game feel for future stuff XD