The controls work fine, I only have some problems with dashing (iPad), sometimes I accidentially dash (when I quickly want to collect some coins in front of me) but often it just doesn’t dash. I probably need a ‘dash’ button in a corner.
I do like the game, but it is currently too hard to level up your boss. I fought multiple bosses of other players and gained 100 DR, but nobody fought my boss. I really want to level my boss for more energy as that only unlocks one slot per levelup (it does say +2 when leveling though). And doing the missions seems useless as it only increases your multiplier and score doesn’t seem to affect anything.
//EDIT: Forgot time zones, my boss fights about 3 battles every night and that earns a nice amount of xp. I like it.
And bosses do earn 2 slots per level, just not for the first levelup.