I'm going to go with PLR. Balancing out the middle spawns when thermal was in development didn't seem to work out too well, and all the other types are bland.
I think a volcanic-themed PLR map could be quite interesting.
Judging by Kelvin A2, I think you need to brush up on understanding some TF2 mapping concepts before starting a map (Sniper line of sight into spawn = BAD), and second, actually try and collect feedback and release new versions of a map before throwing it out because it didn't work well.
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