Cute game, definitely needs more of its own mechanical identity to not be called a Digseum clone.
Mechanically, the increasing requirement for beam power means none of the other upgrades are impactful after the first one or two. I can clear the entire field of map three with one upgrade of the field of view and two fuel upgrades, but I'll need 4 beam power upgrades to have enough. That would be fine, except the scaling on beam upgrades isn't any less than any other upgrade