More for the development side than the gameplay side
In the main option screen, or maybe on the 'searching for battle ' screen, have questions regarding the features of the game.

e.g. after the recent update, if there was a question do you like the new knockback?' everyone who plays could answer no, and it could be removed immediately, rather than waiting for the few people who post on this forum to comment on it, which may not even be a good representation of the non-forum masses

That would be kinda cool Since we are testing and changing it all the time I think that asking for feedback as frequently as possible is a good idea

Yes from me

I love it so far. I love the new "rare" items. I'm glad I saved up enough for a LOT of rare items... teehehehehehehehe. It gives me a huge advantage. The knock back also gives me a HUGE advantage as a far range mech fighter.... MWAHAHAAHHH!@!@!!@!@!

* me looking at the title "In game poll" *
Hey! Everybody knows Mechs don't swim, what is he thinking!

Excuse my humour, I liked your idea.
btw, I'm not happy with new knockback.

But what if they did?
You've just given me a brilliant idea for another topic

Also, can some modmin add a poll(yes|no|maybe) to this topic about polls.

I knew it was going to this :3