Can you make some co-op versions. 2 players, 3 player etc.

I'd like to discuss the single phase boss mechanic as that seems to be where most of our time is lost. (I'm about to upload duos and trios runs which puts us about half way up each list respectively).

Is there currently a game mechanic that causes the first boss or second boss to stay in phase 1? (Not the golem) Every successful run I see on the board consists of no second phase.

Yesterday we had an amazing run going and after doing about half the second bosses armor bar (before his second beem) he went underground... I thought the mechanic would be to do a ton of damage to keep him in the first phase but that wasn't the case last night. Also, on a side note, has anyone attempted to force him to melee to keep him in phase 1 longer?

Any tips on bosses 1-2 would be much appreciated.

In case it's needed. We were running on normal.