Thank you for playing the game and giving me feedback :) I'm happy that you enjoyed the game.
I tried to make different types of gadgets, one of them was miss-able gadgets, where you have to activate it or will be missed. There are other gadget types like auto-activating, passive, non-miss-able (the type you had in mind), timed, etc.
The reason for the "exact number" mechanic was so the player plays the game rhythmically, like 7 clicks, space, 7 clicks, space, etc. Combined with other gadgets, madness awaits the player!