Yeah we're working (mentally, I'm still a bit exhausted from the jam to work on this game right now) on unfair damage situations for the future. There was to be a mobility upgrade, but it would have pertained to an area type that was cut from the final game.
Special totem rooms (and powerup rooms in general) are a wonderful idea! The structure's in place to do those, but obviously actually doing them, assuming they do end up lining up with the plan, will be waiting for SMVM.
As will a map. I'm pretty sure once I'm not feeling the time-pressure of the monthlong jam, that'll end up being pretty easy.
Thanks for your feedback--it will be studiously noted and over-analyzed.