you've understood how it works! the original idea is that the ability is a weaker starting point from which to grow, by taking more abilities, into completely dominating the room, but not directly doing damage yourself. something like controlling objects' movements, spawning new ones, causing them to explode, etc. it's the "magikarp" path, if I were to use a pokemon analogy. I'll definitely brainstorm some more direct "last-resort" options for it though, so it's less punishing to be in a bad spot
right now, I agree it is very difficult to use. but I assure you that it is possible to clear every room with just this ability, having designed each room this way. it takes a completely different playstyle though, which is where a lot of the difficulty comes from
hope this has been enlightening, and thanks again for sharing your thoughts! :D