If there is to be a final patch, I have two suggestions for the Arcade:Suggestion #1:
Arcade multiplier glitch(?). I'm not 100% sure if this is actually a glitch, because it's existed and I mentioned it the day Heroes came out, while it's never been 'fixed'. The multiplier can lock up visually. After playing with it awhile, I now wonder if it's a purposeful part of programming. I first discovered it playing co-op Arcade Master/Hero the first day Heroes came out and it seemed like a game-breaking glitch if it didn't grow to maximum without being reset. After returning to Resogun and playing single player Arcade, I realized it happened at the start of Acis Hero. The first few times this occurred, I intentionally lost my multiplier at the start of Acis to reset it back to 0x so it could grow.
Then I learned, every time I went through Master Arcade 10-stacking every level and never dropping multiplier, my multiplier would always start at either 43x or 46x at the start of Acis Hero literally every single time (I haven't yet figured out what determines 43x vs. 46x though). Because the multiplier visually stayed at one of those two numbers even while killing enemies, I continued to intentionally lose the multiplier at the start of Acis Hero. Then one time, I said 'fuck it'.
That's when I finally learned the multiplier doesn't start visually going back up until the game's actual multiplier registers 43x or 46x once you've killed enough enemies as if your actual multiplier had started at 20x in Hero all along just like the original Arcade always did when never losing the multiplier in Master Arcade.
In co-op, this glitch(?) is more severe, since it's not only visual and CAN affect end-game score. The multiplier can do the same thing at the start of Acis Hero as it does in single player if the multiplier is never lost in Master and remains purely an aesthetic problem. However, when saving an extra life human after your partner is dead and has 0 lives, the multiplier can max out immediately (20x in Master, 100x in Hero).
This is abuse-able, because doing this can allow a 20x multiplier by the end of Acis Master and a 100x multiplier by the end of Acis Hero if your partner suicides to 0 lives, then you hold the extra life human to save first at the beginning of an Acis 10-stack, then save all the humans on a normally impossibly maxed multiplier. In the end, a 20x Acis Master 10-stack vs. a 17x Acis Master 10-stack isn't much of a points difference, but an 82x Acis Hero 10-stack vs. a 100x Acis Hero 10-stack can be a significant difference if a team was so willing and able to abuse this (despite its risk and difficulty for the player who didn't suicide).
But I have considered the extra life human max multiplier save trick with a dead ally and 0 lives as a programmed reward for the player who didn't die all game, as well as a reward for the lesser teammate getting to come back to life.
In this regard, if this is a glitch and not a programmed reward, here is a 1-minute replay of the first time this happened to me in co-op Arcade Febris Hero, which did make playing co-op a lot more fun with a lesser teammate who uses up your lives and bombs, as we both tripped out when he was brought back to life and the multiplier was automatically maxed:https://www.youtube.com/watch?v=hg4xjVroZB8Suggestion #2:
Add a "Restart Game" and a "Restart Level" option for co-op Arcade, the same way you did in single player Arcade. This would be even more beneficial in co-op Arcade, because every time you want to restart the run, you have to go back through the PSN invite process, which is much more of a pain in the ass than just having to go through the Resogun menus, especially when PSN is lagging and the entire friends list won't load.