I have an idea for the Scientist, when the players are reducing damage from your shield generator, you should get points, but not much as the reduced damage
Also, I feel like there should be another type of bomb aside from the epoxy bomb. One that causes x damage for x seconds, or that decreases a boss's damage resistance (less damaging than crits, but more than the regular hits)
too similar to the Jarate in tf2 aaaa. Perhaps have the DoT scale with player count although it may need some polishing. For instance, the base damage is 50/s for 4 s and +10% damage for each player in the minigame. Not expontional, but 10% of 50 (5) each time. Either that, or the duration of the bomb is increased for every person.