200if pumpkins are tf_generic_bombs with extremely low respawn times, that should work in multiplayer just fine, I don't see any possible issues. if players can't hit other players with them, it is fine
The issue would be more along the lines of using them to exploit stuff in Tempus. The same issues happened with Bumper Cars and the Halloween mini effect on my previous maps. I can't really think of anything that they could be used for but i'm sure given enough time someone could find a way to abuse them.
Starkiereally cool map, one of the few gimmick maps thats actually fun
the skybox on 11 feels too low and the pumpkins on 5 are a little strong (i dunno if you can actually make them weaker)
I could make the pumpkins slightly weaker per jump but for consistancy/simplicity I chose to keep them all the same. 5 is a pretty strange jump since you're not getting a large amount of height so the catches will still push you just out of an additonal rocket range so you need to prefire the rockets pretty early so you're not going to bounce yourself too far back on it.
As for 11 from testing it never really felt like the skybox was too low unless you were climbing up into the pumpkin since I normally would get most of my height and then turn the corner to take it from the side. A lot of the jumps do have lower cielings to prevent people from resyncing on the pumpkins to skip the jumps since before most of them were super easily cheatable by doing that so I will likely be keeping most of them the same to avoid that.