Yes, that's some very powerful long range going on there. lol Could possibly use more time (in-game) to power it up for harder enemies?
That certainly could be a possibility... I never tried to make a time based power up, but it could be an interesting challenge. I would have to limit it to certain degree otherwise it could destroy all enemies again, tho it would come at a price of a lot of time. Ot I could also make a level up/upgrade system allowing for pushing that limit higher allowing for more damage both long range and close range.