I haven't played ender yet but it sounds interesting so i came up with these :DThey could add a kit that gives 100% or even more battery for your torch. A medkit to heal your HP and even more.
How about abilities and power ups instead?
-Pay 500 points to increase the torch's battery (constantly, like skywars abilities)
-Increase you're field of view by 1 or 2 blocks
-Have a compass point to the closest page for 5 seconds then disappear (the time the compass lasts is just an example:) )
-Slowness/Freeze/Blindness Potion effect for ender if you are in danger (when you are getting hit or being chased by him)
-Ability to sprint with a certain amount of time before getting tired (just like slender man, having to walk to re fill the energy)
-Ability to hit the ender once with a chance to freeze him/her (doesn't inflict damage to the ender)
Suggestion
-Ability to spectate players in 1st person mode ONLY !