Shield Fish ended up a little over-tuned; everyone hates him. The last time I did a balancing pass, I forgot to adjust his attack speed with the rest, haha.
For the health regen, I actually wanted to rebuild the entire system toward the end. It's increasing the frequency that you heal a fixed amount, and I agree that it's unimpactful with how short matches are most of the time. I wanted the matches to be quick, though, so we tried at one point to tweak it to happen more frequently, and even if we moved it only slightly, it became too OP. I think the plan post-jam will be to make the health regen stat directly impact the amount and not the frequency. I will probably also fire it once during the first frame of the match so you are always getting something out of it.
Thanks for playing and for the feedback; I'm glad you enjoyed it!