I'm glad to hear the game feels nice to play, it was very important to me for this to be the case!
and yes I definitely agree that the blue-tenna is very difficult to use compared to the other two. this was intentional, but I'm also brainstorming on possible ways to buff it in the future :)
Personally I would like there to be some way to actively kill bugs with it. Unless I misunderstood how it works the only way to kill bugs with it is to lure them into the spikes you push out of square blocks which is very unreliable. I like the idea of modifying the environment to help you clear levels but the offensive capability seems lacking since you have no other weapons, at least until you find more.
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