Will you add achievements, more levels and single player?

First I can't skip the intro. Then I'm just stuck on the "Oops! You have no Melbits." screen with no button prompts, only settings (start button) is available. Tried with PS4 and Xbox controller. Any help?

How many players can play at the same time in Shared/Split Screen Co-op?

The store page says it needs a controller to play... but on YouTube everyone is playing on the phone. Personally I avoid games controlled by phones and love good controller local multiplayer games, so I would like to know which is it?

So after our first play through we caught on with how to unlock the stickers. We selected the shapes we needed then someone accidentally pressed back. When we started the round again we couldn't select one or two of the melbits we had selected before. This happened at least three times so it seems pretty repeatable....