You mention hints in the description, but I don't think the gamebar is implemented in this version?
With that said, it's surprisingly possible, given how complex the interactions are, to infer what's going on. It does create a strange dynamic though where I'm really curious what the 5 and 6 reduction powers do, but can't quite bring myself to downsize and find out.. But given how hard it was to get to 7, I think I might have to explore that path :)
Some things do feel like they're at the limit of infer-ability — I've noticed that the push (4 reduction) power can leave behind a tile after it's been used. But have yet to deduce what it does!