I have the latest version of Minewatch, Minecraft, and Forge and do not have any mods installed
*Mercy's Guardian Angle straight up dose not work even if you look in the direction of your teammate.
*I thought if you kill someone with reaper they drop souls and you pick them up to get healed not just when you shoot them.

Mercy's Guardian Angel not working was reported and is fixed for the next update.
Reaper no longer drops souls in Overwatch and therefore does not in Minewatch.